working-config-otel

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

vendor/github.com/google/s2a-go/internal/v2/README.md

@@ -0,0 +1 @@
+**This directory has the implementation of the S2Av2's gRPC-Go client libraries**

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

@@ -0,0 +1,122 @@
+/*
+ *
+ * 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 certverifier offloads verifications to S2Av2.
+package certverifier
+
+import (
+	"crypto/x509"
+	"fmt"
+
+	"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"
+)
+
+// VerifyClientCertificateChain builds a SessionReq, sends it to S2Av2 and
+// receives a SessionResp.
+func VerifyClientCertificateChain(verificationMode s2av2pb.ValidatePeerCertificateChainReq_VerificationMode, s2AStream stream.S2AStream) func(rawCerts [][]byte, verifiedChains [][]*x509.Certificate) error {
+	return func(rawCerts [][]byte, verifiedChains [][]*x509.Certificate) error {
+		// Offload verification to S2Av2.
+		if grpclog.V(1) {
+			grpclog.Infof("Sending request to S2Av2 for client peer cert chain validation.")
+		}
+		if err := s2AStream.Send(&s2av2pb.SessionReq{
+			ReqOneof: &s2av2pb.SessionReq_ValidatePeerCertificateChainReq{
+				ValidatePeerCertificateChainReq: &s2av2pb.ValidatePeerCertificateChainReq{
+					Mode: verificationMode,
+					PeerOneof: &s2av2pb.ValidatePeerCertificateChainReq_ClientPeer_{
+						ClientPeer: &s2av2pb.ValidatePeerCertificateChainReq_ClientPeer{
+							CertificateChain: rawCerts,
+						},
+					},
+				},
+			},
+		}); err != nil {
+			grpclog.Infof("Failed to send request to S2Av2 for client peer cert chain validation.")
+			return err
+		}
+
+		// Get the response from S2Av2.
+		resp, err := s2AStream.Recv()
+		if err != nil {
+			grpclog.Infof("Failed to receive client peer cert chain validation response from S2Av2.")
+			return err
+		}
+
+		// Parse the response.
+		if (resp.GetStatus() != nil) && (resp.GetStatus().Code != uint32(codes.OK)) {
+			return fmt.Errorf("failed to offload client cert verification to S2A: %d, %v", resp.GetStatus().Code, resp.GetStatus().Details)
+
+		}
+
+		if resp.GetValidatePeerCertificateChainResp().ValidationResult != s2av2pb.ValidatePeerCertificateChainResp_SUCCESS {
+			return fmt.Errorf("client cert verification failed: %v", resp.GetValidatePeerCertificateChainResp().ValidationDetails)
+		}
+
+		return nil
+	}
+}
+
+// VerifyServerCertificateChain builds a SessionReq, sends it to S2Av2 and
+// receives a SessionResp.
+func VerifyServerCertificateChain(hostname string, verificationMode s2av2pb.ValidatePeerCertificateChainReq_VerificationMode, s2AStream stream.S2AStream, serverAuthorizationPolicy []byte) func(rawCerts [][]byte, verifiedChains [][]*x509.Certificate) error {
+	return func(rawCerts [][]byte, verifiedChains [][]*x509.Certificate) error {
+		// Offload verification to S2Av2.
+		if grpclog.V(1) {
+			grpclog.Infof("Sending request to S2Av2 for server peer cert chain validation.")
+		}
+		if err := s2AStream.Send(&s2av2pb.SessionReq{
+			ReqOneof: &s2av2pb.SessionReq_ValidatePeerCertificateChainReq{
+				ValidatePeerCertificateChainReq: &s2av2pb.ValidatePeerCertificateChainReq{
+					Mode: verificationMode,
+					PeerOneof: &s2av2pb.ValidatePeerCertificateChainReq_ServerPeer_{
+						ServerPeer: &s2av2pb.ValidatePeerCertificateChainReq_ServerPeer{
+							CertificateChain:                   rawCerts,
+							ServerHostname:                     hostname,
+							SerializedUnrestrictedClientPolicy: serverAuthorizationPolicy,
+						},
+					},
+				},
+			},
+		}); err != nil {
+			grpclog.Infof("Failed to send request to S2Av2 for server peer cert chain validation.")
+			return err
+		}
+
+		// Get the response from S2Av2.
+		resp, err := s2AStream.Recv()
+		if err != nil {
+			grpclog.Infof("Failed to receive server peer cert chain validation response from S2Av2.")
+			return err
+		}
+
+		// Parse the response.
+		if (resp.GetStatus() != nil) && (resp.GetStatus().Code != uint32(codes.OK)) {
+			return fmt.Errorf("failed to offload server cert verification to S2A: %d, %v", resp.GetStatus().Code, resp.GetStatus().Details)
+		}
+
+		if resp.GetValidatePeerCertificateChainResp().ValidationResult != s2av2pb.ValidatePeerCertificateChainResp_SUCCESS {
+			return fmt.Errorf("server cert verification failed: %v", resp.GetValidatePeerCertificateChainResp().ValidationDetails)
+		}
+
+		return nil
+	}
+}

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
+YWxlMRAwDgYDVQQKDAdDb21wYW55MREwDwYDVQQLDAhEaXZpc2lvbjEWMBQGA1UE
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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
++Rla5HQ6o+HsyHPGlH+G83CkjmYmwBUFYUxrkq15wVkufJm3AfKWtE3VBfO4us7G
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+68kvfXoect+ECkMx8/xT5i//LU39i+BpI5KURwIDAQABAoIBABgyjo/6iLzUMFbZ
+/+w3pW6orrdIgN2akvTfED9pVYFgUA+jc3hRhY95bkNnjuaL2cy7Cc4Tk65mfRQL
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+VIuPenqsPoI3PPTHTU/hW+XKnWIhElgmGRdUrto9Q6IT/Y5RtSMLTLjq+Tzwb/fm
+56rziYv2XJsfwgAvnI8z1Kqrto9ePsHYf3krJ1/thVsZPc9bq/QY3ohD1sLvcuaT
+GgBBnLOVJU3a12/ZE2RwOwKBgF0csWMAoj8/5IB6if+3ral2xOGsl7oPZVMo/J2V
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+qR4poj1gfbnMxNuI9UzIXzjEmGewx9kDZ7IYnvloZKqoVQODO5GlKF2ja6IcMNlh
+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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+MA8GA1UdEwEB/wQFMAMBAf8wDQYJKoZIhvcNAQELBQADggEBADj0vQ6ykWhicoqR
+e6VZMwlEJV7/DSvWWKBd9MUjfKye0A4565ya5lmnzP3DiD3nqGe3miqmLsXKDs+X
+POqlPXTWIamP7D4MJ32XtSLwZB4ru+I+Ao/P/VngPepoRPQoBnzHe7jww0rokqxl
+AZERjlbTUwUAy/BPWPSzSJZ2j0tcs6ZLDNyYzpK4ao8R9/1VmQ92Tcp3feJs1QTg
+odRQc3om/AkWOwsll+oyX0UbJeHkFHiLanUPXbdh+/BkSvZJ8ynL+feSDdaurPe+
+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-----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+-----END RSA PRIVATE KEY-----

vendor/github.com/google/s2a-go/internal/v2/s2av2.go

@@ -0,0 +1,391 @@
+/*
+ *
+ * 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 v2 provides the S2Av2 transport credentials used by a gRPC
+// application.
+package v2
+
+import (
+	"context"
+	"crypto/tls"
+	"errors"
+	"net"
+	"os"
+	"time"
+
+	"github.com/golang/protobuf/proto"
+	"github.com/google/s2a-go/fallback"
+	"github.com/google/s2a-go/internal/handshaker/service"
+	"github.com/google/s2a-go/internal/tokenmanager"
+	"github.com/google/s2a-go/internal/v2/tlsconfigstore"
+	"github.com/google/s2a-go/retry"
+	"github.com/google/s2a-go/stream"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials"
+	"google.golang.org/grpc/grpclog"
+
+	commonpbv1 "github.com/google/s2a-go/internal/proto/common_go_proto"
+	s2av2pb "github.com/google/s2a-go/internal/proto/v2/s2a_go_proto"
+)
+
+const (
+	s2aSecurityProtocol = "tls"
+	defaultS2ATimeout   = 6 * time.Second
+)
+
+// An environment variable, which sets the timeout enforced on the connection to the S2A service for handshake.
+const s2aTimeoutEnv = "S2A_TIMEOUT"
+
+type s2av2TransportCreds struct {
+	info           *credentials.ProtocolInfo
+	isClient       bool
+	serverName     string
+	s2av2Address   string
+	transportCreds credentials.TransportCredentials
+	tokenManager   *tokenmanager.AccessTokenManager
+	// localIdentity should only be used by the client.
+	localIdentity *commonpbv1.Identity
+	// localIdentities should only be used by the server.
+	localIdentities           []*commonpbv1.Identity
+	verificationMode          s2av2pb.ValidatePeerCertificateChainReq_VerificationMode
+	fallbackClientHandshake   fallback.ClientHandshake
+	getS2AStream              func(ctx context.Context, s2av2Address string) (stream.S2AStream, error)
+	serverAuthorizationPolicy []byte
+}
+
+// NewClientCreds returns a client-side transport credentials object that uses
+// the S2Av2 to establish a secure connection with a server.
+func NewClientCreds(s2av2Address string, transportCreds credentials.TransportCredentials, localIdentity *commonpbv1.Identity, verificationMode s2av2pb.ValidatePeerCertificateChainReq_VerificationMode, fallbackClientHandshakeFunc fallback.ClientHandshake, getS2AStream func(ctx context.Context, s2av2Address string) (stream.S2AStream, error), serverAuthorizationPolicy []byte) (credentials.TransportCredentials, error) {
+	// Create an AccessTokenManager instance to use to authenticate to S2Av2.
+	accessTokenManager, err := tokenmanager.NewSingleTokenAccessTokenManager()
+
+	creds := &s2av2TransportCreds{
+		info: &credentials.ProtocolInfo{
+			SecurityProtocol: s2aSecurityProtocol,
+		},
+		isClient:                  true,
+		serverName:                "",
+		s2av2Address:              s2av2Address,
+		transportCreds:            transportCreds,
+		localIdentity:             localIdentity,
+		verificationMode:          verificationMode,
+		fallbackClientHandshake:   fallbackClientHandshakeFunc,
+		getS2AStream:              getS2AStream,
+		serverAuthorizationPolicy: serverAuthorizationPolicy,
+	}
+	if err != nil {
+		creds.tokenManager = nil
+	} else {
+		creds.tokenManager = &accessTokenManager
+	}
+	if grpclog.V(1) {
+		grpclog.Info("Created client S2Av2 transport credentials.")
+	}
+	return creds, nil
+}
+
+// NewServerCreds returns a server-side transport credentials object that uses
+// the S2Av2 to establish a secure connection with a client.
+func NewServerCreds(s2av2Address string, transportCreds credentials.TransportCredentials, localIdentities []*commonpbv1.Identity, verificationMode s2av2pb.ValidatePeerCertificateChainReq_VerificationMode, getS2AStream func(ctx context.Context, s2av2Address string) (stream.S2AStream, error)) (credentials.TransportCredentials, error) {
+	// Create an AccessTokenManager instance to use to authenticate to S2Av2.
+	accessTokenManager, err := tokenmanager.NewSingleTokenAccessTokenManager()
+	creds := &s2av2TransportCreds{
+		info: &credentials.ProtocolInfo{
+			SecurityProtocol: s2aSecurityProtocol,
+		},
+		isClient:         false,
+		s2av2Address:     s2av2Address,
+		transportCreds:   transportCreds,
+		localIdentities:  localIdentities,
+		verificationMode: verificationMode,
+		getS2AStream:     getS2AStream,
+	}
+	if err != nil {
+		creds.tokenManager = nil
+	} else {
+		creds.tokenManager = &accessTokenManager
+	}
+	if grpclog.V(1) {
+		grpclog.Info("Created server S2Av2 transport credentials.")
+	}
+	return creds, nil
+}
+
+// ClientHandshake performs a client-side mTLS handshake using the S2Av2.
+func (c *s2av2TransportCreds) ClientHandshake(ctx context.Context, serverAuthority string, rawConn net.Conn) (net.Conn, credentials.AuthInfo, error) {
+	if !c.isClient {
+		return nil, nil, errors.New("client handshake called using server transport credentials")
+	}
+	// Remove the port from serverAuthority.
+	serverName := removeServerNamePort(serverAuthority)
+	timeoutCtx, cancel := context.WithTimeout(ctx, GetS2ATimeout())
+	defer cancel()
+	var s2AStream stream.S2AStream
+	var err error
+	retry.Run(timeoutCtx,
+		func() error {
+			s2AStream, err = createStream(timeoutCtx, c.s2av2Address, c.transportCreds, c.getS2AStream)
+			return err
+		})
+	if err != nil {
+		grpclog.Infof("Failed to connect to S2Av2: %v", err)
+		if c.fallbackClientHandshake != nil {
+			return c.fallbackClientHandshake(ctx, serverAuthority, rawConn, err)
+		}
+		return nil, nil, err
+	}
+	defer s2AStream.CloseSend()
+	if grpclog.V(1) {
+		grpclog.Infof("Connected to S2Av2.")
+	}
+	var config *tls.Config
+
+	var tokenManager tokenmanager.AccessTokenManager
+	if c.tokenManager == nil {
+		tokenManager = nil
+	} else {
+		tokenManager = *c.tokenManager
+	}
+
+	sn := serverName
+	if c.serverName != "" {
+		sn = c.serverName
+	}
+	retry.Run(timeoutCtx,
+		func() error {
+			config, err = tlsconfigstore.GetTLSConfigurationForClient(sn, s2AStream, tokenManager, c.localIdentity, c.verificationMode, c.serverAuthorizationPolicy)
+			return err
+		})
+	if err != nil {
+		grpclog.Info("Failed to get client TLS config from S2Av2: %v", err)
+		if c.fallbackClientHandshake != nil {
+			return c.fallbackClientHandshake(ctx, serverAuthority, rawConn, err)
+		}
+		return nil, nil, err
+	}
+	if grpclog.V(1) {
+		grpclog.Infof("Got client TLS config from S2Av2.")
+	}
+
+	creds := credentials.NewTLS(config)
+	var conn net.Conn
+	var authInfo credentials.AuthInfo
+	retry.Run(timeoutCtx,
+		func() error {
+			conn, authInfo, err = creds.ClientHandshake(timeoutCtx, serverName, rawConn)
+			return err
+		})
+	if err != nil {
+		grpclog.Infof("Failed to do client handshake using S2Av2: %v", err)
+		if c.fallbackClientHandshake != nil {
+			return c.fallbackClientHandshake(ctx, serverAuthority, rawConn, err)
+		}
+		return nil, nil, err
+	}
+	grpclog.Infof("Successfully done client handshake using S2Av2 to: %s", serverName)
+
+	return conn, authInfo, err
+}
+
+// ServerHandshake performs a server-side mTLS handshake using the S2Av2.
+func (c *s2av2TransportCreds) ServerHandshake(rawConn net.Conn) (net.Conn, credentials.AuthInfo, error) {
+	if c.isClient {
+		return nil, nil, errors.New("server handshake called using client transport credentials")
+	}
+	ctx, cancel := context.WithTimeout(context.Background(), GetS2ATimeout())
+	defer cancel()
+	var s2AStream stream.S2AStream
+	var err error
+	retry.Run(ctx,
+		func() error {
+			s2AStream, err = createStream(ctx, c.s2av2Address, c.transportCreds, c.getS2AStream)
+			return err
+		})
+	if err != nil {
+		grpclog.Infof("Failed to connect to S2Av2: %v", err)
+		return nil, nil, err
+	}
+	defer s2AStream.CloseSend()
+	if grpclog.V(1) {
+		grpclog.Infof("Connected to S2Av2.")
+	}
+
+	var tokenManager tokenmanager.AccessTokenManager
+	if c.tokenManager == nil {
+		tokenManager = nil
+	} else {
+		tokenManager = *c.tokenManager
+	}
+
+	var config *tls.Config
+	retry.Run(ctx,
+		func() error {
+			config, err = tlsconfigstore.GetTLSConfigurationForServer(s2AStream, tokenManager, c.localIdentities, c.verificationMode)
+			return err
+		})
+	if err != nil {
+		grpclog.Infof("Failed to get server TLS config from S2Av2: %v", err)
+		return nil, nil, err
+	}
+	if grpclog.V(1) {
+		grpclog.Infof("Got server TLS config from S2Av2.")
+	}
+
+	creds := credentials.NewTLS(config)
+	var conn net.Conn
+	var authInfo credentials.AuthInfo
+	retry.Run(ctx,
+		func() error {
+			conn, authInfo, err = creds.ServerHandshake(rawConn)
+			return err
+		})
+	if err != nil {
+		grpclog.Infof("Failed to do server handshake using S2Av2: %v", err)
+		return nil, nil, err
+	}
+	return conn, authInfo, err
+}
+
+// Info returns protocol info of s2av2TransportCreds.
+func (c *s2av2TransportCreds) Info() credentials.ProtocolInfo {
+	return *c.info
+}
+
+// Clone makes a deep copy of s2av2TransportCreds.
+func (c *s2av2TransportCreds) Clone() credentials.TransportCredentials {
+	info := *c.info
+	serverName := c.serverName
+	fallbackClientHandshake := c.fallbackClientHandshake
+
+	s2av2Address := c.s2av2Address
+	var tokenManager tokenmanager.AccessTokenManager
+	if c.tokenManager == nil {
+		tokenManager = nil
+	} else {
+		tokenManager = *c.tokenManager
+	}
+	verificationMode := c.verificationMode
+	var localIdentity *commonpbv1.Identity
+	if c.localIdentity != nil {
+		localIdentity = proto.Clone(c.localIdentity).(*commonpbv1.Identity)
+	}
+	var localIdentities []*commonpbv1.Identity
+	if c.localIdentities != nil {
+		localIdentities = make([]*commonpbv1.Identity, len(c.localIdentities))
+		for i, localIdentity := range c.localIdentities {
+			localIdentities[i] = proto.Clone(localIdentity).(*commonpbv1.Identity)
+		}
+	}
+	creds := &s2av2TransportCreds{
+		info:                    &info,
+		isClient:                c.isClient,
+		serverName:              serverName,
+		fallbackClientHandshake: fallbackClientHandshake,
+		s2av2Address:            s2av2Address,
+		localIdentity:           localIdentity,
+		localIdentities:         localIdentities,
+		verificationMode:        verificationMode,
+	}
+	if c.tokenManager == nil {
+		creds.tokenManager = nil
+	} else {
+		creds.tokenManager = &tokenManager
+	}
+	return creds
+}
+
+// NewClientTLSConfig returns a tls.Config instance that uses S2Av2 to establish a TLS connection as
+// a client. The tls.Config MUST only be used to establish a single TLS connection.
+func NewClientTLSConfig(
+	ctx context.Context,
+	s2av2Address string,
+	transportCreds credentials.TransportCredentials,
+	tokenManager tokenmanager.AccessTokenManager,
+	verificationMode s2av2pb.ValidatePeerCertificateChainReq_VerificationMode,
+	serverName string,
+	serverAuthorizationPolicy []byte) (*tls.Config, error) {
+	s2AStream, err := createStream(ctx, s2av2Address, transportCreds, nil)
+	if err != nil {
+		grpclog.Infof("Failed to connect to S2Av2: %v", err)
+		return nil, err
+	}
+
+	return tlsconfigstore.GetTLSConfigurationForClient(removeServerNamePort(serverName), s2AStream, tokenManager, nil, verificationMode, serverAuthorizationPolicy)
+}
+
+// OverrideServerName sets the ServerName in the s2av2TransportCreds protocol
+// info. The ServerName MUST be a hostname.
+func (c *s2av2TransportCreds) OverrideServerName(serverNameOverride string) error {
+	serverName := removeServerNamePort(serverNameOverride)
+	c.info.ServerName = serverName
+	c.serverName = serverName
+	return nil
+}
+
+// Remove the trailing port from server name.
+func removeServerNamePort(serverName string) string {
+	name, _, err := net.SplitHostPort(serverName)
+	if err != nil {
+		name = serverName
+	}
+	return name
+}
+
+type s2AGrpcStream struct {
+	stream s2av2pb.S2AService_SetUpSessionClient
+}
+
+func (x s2AGrpcStream) Send(m *s2av2pb.SessionReq) error {
+	return x.stream.Send(m)
+}
+
+func (x s2AGrpcStream) Recv() (*s2av2pb.SessionResp, error) {
+	return x.stream.Recv()
+}
+
+func (x s2AGrpcStream) CloseSend() error {
+	return x.stream.CloseSend()
+}
+
+func createStream(ctx context.Context, s2av2Address string, transportCreds credentials.TransportCredentials, getS2AStream func(ctx context.Context, s2av2Address string) (stream.S2AStream, error)) (stream.S2AStream, error) {
+	if getS2AStream != nil {
+		return getS2AStream(ctx, s2av2Address)
+	}
+	// TODO(rmehta19): Consider whether to close the connection to S2Av2.
+	conn, err := service.Dial(ctx, s2av2Address, transportCreds)
+	if err != nil {
+		return nil, err
+	}
+	client := s2av2pb.NewS2AServiceClient(conn)
+	gRPCStream, err := client.SetUpSession(ctx, []grpc.CallOption{}...)
+	if err != nil {
+		return nil, err
+	}
+	return &s2AGrpcStream{
+		stream: gRPCStream,
+	}, nil
+}
+
+// GetS2ATimeout returns the timeout enforced on the connection to the S2A service for handshake.
+func GetS2ATimeout() time.Duration {
+	timeout, err := time.ParseDuration(os.Getenv(s2aTimeoutEnv))
+	if err != nil {
+		return defaultS2ATimeout
+	}
+	return timeout
+}

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

@@ -0,0 +1,24 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----

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

@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
+MIIEogIBAAKCAQEA44W4i5wftdd+iEbEp3e5H+KFQD8t125H0jyR+lQRurkE63zF
+l7n9if1rWjMQdVbpw4BsdufABHy2RKBn+3jZAgDaTvsdZTUmHbGIQiwmK+jeKabj
++Rla5HQ6o+HsyHPGlH+G83CkjmYmwBUFYUxrkq15wVkufJm3AfKWtE3VBfO4us7G
+4oW58rdEptMAFJyflFtkv3vof+OB9J5etu3bjY2sigGdV7p9Ft6RurYNDrMUCttA
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+-----END RSA PRIVATE KEY-----

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

@@ -0,0 +1,24 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

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

@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
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+-----END RSA PRIVATE KEY-----

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

@@ -0,0 +1,24 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

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

@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
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+-----END RSA PRIVATE KEY-----

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

@@ -0,0 +1,24 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

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

@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
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+7JShPhVioyOMNb39jnYBOWbjkm4d4QgqRuiytSR0oi3QI+Ziy5EYMyNn713qAk9j
+r2TJZDDPDKnBW+zt4YI4EohWMXk3JRUW4XDKggjjwJQA7bZ812TtHHvP/xoThfG7
+eSNb3eECgYBw6ssgCtMrdvQiEmjKVX/9yI38mvC2kSGyzbrQnGUfgqRGomRpeZuD
+B5E3kysA4td5pT5lvcLgSW0TbOz+YbiriXjwOihPIelCvc9gE2eOUI71/byUWPFz
+7u5F/xQ4NaGr5suLF+lBC6h7pSbM4El9lIHQAQadpuEdzHqrw+hs3g==
+-----END RSA PRIVATE KEY-----

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

@@ -0,0 +1,404 @@
+/*
+ *
+ * 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 tlsconfigstore offloads operations to S2Av2.
+package tlsconfigstore
+
+import (
+	"crypto/tls"
+	"crypto/x509"
+	"encoding/pem"
+	"errors"
+	"fmt"
+
+	"github.com/google/s2a-go/internal/tokenmanager"
+	"github.com/google/s2a-go/internal/v2/certverifier"
+	"github.com/google/s2a-go/internal/v2/remotesigner"
+	"github.com/google/s2a-go/stream"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/grpclog"
+
+	commonpbv1 "github.com/google/s2a-go/internal/proto/common_go_proto"
+	commonpb "github.com/google/s2a-go/internal/proto/v2/common_go_proto"
+	s2av2pb "github.com/google/s2a-go/internal/proto/v2/s2a_go_proto"
+)
+
+const (
+	// HTTP/2
+	h2 = "h2"
+)
+
+// GetTLSConfigurationForClient returns a tls.Config instance for use by a client application.
+func GetTLSConfigurationForClient(serverHostname string, s2AStream stream.S2AStream, tokenManager tokenmanager.AccessTokenManager, localIdentity *commonpbv1.Identity, verificationMode s2av2pb.ValidatePeerCertificateChainReq_VerificationMode, serverAuthorizationPolicy []byte) (*tls.Config, error) {
+	authMechanisms := getAuthMechanisms(tokenManager, []*commonpbv1.Identity{localIdentity})
+
+	if grpclog.V(1) {
+		grpclog.Infof("Sending request to S2Av2 for client TLS config.")
+	}
+	// Send request to S2Av2 for config.
+	if err := s2AStream.Send(&s2av2pb.SessionReq{
+		LocalIdentity:            localIdentity,
+		AuthenticationMechanisms: authMechanisms,
+		ReqOneof: &s2av2pb.SessionReq_GetTlsConfigurationReq{
+			GetTlsConfigurationReq: &s2av2pb.GetTlsConfigurationReq{
+				ConnectionSide: commonpb.ConnectionSide_CONNECTION_SIDE_CLIENT,
+			},
+		},
+	}); err != nil {
+		grpclog.Infof("Failed to send request to S2Av2 for client TLS config")
+		return nil, err
+	}
+
+	// Get the response containing config from S2Av2.
+	resp, err := s2AStream.Recv()
+	if err != nil {
+		grpclog.Infof("Failed to receive client TLS config response from S2Av2.")
+		return nil, err
+	}
+
+	// TODO(rmehta19): Add unit test for this if statement.
+	if (resp.GetStatus() != nil) && (resp.GetStatus().Code != uint32(codes.OK)) {
+		return nil, fmt.Errorf("failed to get TLS configuration from S2A: %d, %v", resp.GetStatus().Code, resp.GetStatus().Details)
+	}
+
+	// Extract TLS configiguration from SessionResp.
+	tlsConfig := resp.GetGetTlsConfigurationResp().GetClientTlsConfiguration()
+
+	var cert tls.Certificate
+	for i, v := range tlsConfig.CertificateChain {
+		// Populate Certificates field.
+		block, _ := pem.Decode([]byte(v))
+		if block == nil {
+			return nil, errors.New("certificate in CertificateChain obtained from S2Av2 is empty")
+		}
+		x509Cert, err := x509.ParseCertificate(block.Bytes)
+		if err != nil {
+			return nil, err
+		}
+		cert.Certificate = append(cert.Certificate, x509Cert.Raw)
+		if i == 0 {
+			cert.Leaf = x509Cert
+		}
+	}
+
+	if len(tlsConfig.CertificateChain) > 0 {
+		cert.PrivateKey = remotesigner.New(cert.Leaf, s2AStream)
+		if cert.PrivateKey == nil {
+			return nil, errors.New("failed to retrieve Private Key from Remote Signer Library")
+		}
+	}
+
+	minVersion, maxVersion, err := getTLSMinMaxVersionsClient(tlsConfig)
+	if err != nil {
+		return nil, err
+	}
+
+	// Create mTLS credentials for client.
+	config := &tls.Config{
+		VerifyPeerCertificate:  certverifier.VerifyServerCertificateChain(serverHostname, verificationMode, s2AStream, serverAuthorizationPolicy),
+		ServerName:             serverHostname,
+		InsecureSkipVerify:     true, // NOLINT
+		ClientSessionCache:     nil,
+		SessionTicketsDisabled: true,
+		MinVersion:             minVersion,
+		MaxVersion:             maxVersion,
+		NextProtos:             []string{h2},
+	}
+	if len(tlsConfig.CertificateChain) > 0 {
+		config.Certificates = []tls.Certificate{cert}
+	}
+	return config, nil
+}
+
+// GetTLSConfigurationForServer returns a tls.Config instance for use by a server application.
+func GetTLSConfigurationForServer(s2AStream stream.S2AStream, tokenManager tokenmanager.AccessTokenManager, localIdentities []*commonpbv1.Identity, verificationMode s2av2pb.ValidatePeerCertificateChainReq_VerificationMode) (*tls.Config, error) {
+	return &tls.Config{
+		GetConfigForClient: ClientConfig(tokenManager, localIdentities, verificationMode, s2AStream),
+	}, nil
+}
+
+// ClientConfig builds a TLS config for a server to establish a secure
+// connection with a client, based on SNI communicated during ClientHello.
+// Ensures that server presents the correct certificate to establish a TLS
+// connection.
+func ClientConfig(tokenManager tokenmanager.AccessTokenManager, localIdentities []*commonpbv1.Identity, verificationMode s2av2pb.ValidatePeerCertificateChainReq_VerificationMode, s2AStream stream.S2AStream) func(chi *tls.ClientHelloInfo) (*tls.Config, error) {
+	return func(chi *tls.ClientHelloInfo) (*tls.Config, error) {
+		tlsConfig, err := getServerConfigFromS2Av2(tokenManager, localIdentities, chi.ServerName, s2AStream)
+		if err != nil {
+			return nil, err
+		}
+
+		var cert tls.Certificate
+		for i, v := range tlsConfig.CertificateChain {
+			// Populate Certificates field.
+			block, _ := pem.Decode([]byte(v))
+			if block == nil {
+				return nil, errors.New("certificate in CertificateChain obtained from S2Av2 is empty")
+			}
+			x509Cert, err := x509.ParseCertificate(block.Bytes)
+			if err != nil {
+				return nil, err
+			}
+			cert.Certificate = append(cert.Certificate, x509Cert.Raw)
+			if i == 0 {
+				cert.Leaf = x509Cert
+			}
+		}
+
+		cert.PrivateKey = remotesigner.New(cert.Leaf, s2AStream)
+		if cert.PrivateKey == nil {
+			return nil, errors.New("failed to retrieve Private Key from Remote Signer Library")
+		}
+
+		minVersion, maxVersion, err := getTLSMinMaxVersionsServer(tlsConfig)
+		if err != nil {
+			return nil, err
+		}
+
+		clientAuth := getTLSClientAuthType(tlsConfig)
+
+		var cipherSuites []uint16
+		cipherSuites = getCipherSuites(tlsConfig.Ciphersuites)
+
+		// Create mTLS credentials for server.
+		return &tls.Config{
+			Certificates:           []tls.Certificate{cert},
+			VerifyPeerCertificate:  certverifier.VerifyClientCertificateChain(verificationMode, s2AStream),
+			ClientAuth:             clientAuth,
+			CipherSuites:           cipherSuites,
+			SessionTicketsDisabled: true,
+			MinVersion:             minVersion,
+			MaxVersion:             maxVersion,
+			NextProtos:             []string{h2},
+		}, nil
+	}
+}
+
+func getCipherSuites(tlsConfigCipherSuites []commonpb.Ciphersuite) []uint16 {
+	var tlsGoCipherSuites []uint16
+	for _, v := range tlsConfigCipherSuites {
+		s := getTLSCipherSuite(v)
+		if s != 0xffff {
+			tlsGoCipherSuites = append(tlsGoCipherSuites, s)
+		}
+	}
+	return tlsGoCipherSuites
+}
+
+func getTLSCipherSuite(tlsCipherSuite commonpb.Ciphersuite) uint16 {
+	switch tlsCipherSuite {
+	case commonpb.Ciphersuite_CIPHERSUITE_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256:
+		return tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256
+	case commonpb.Ciphersuite_CIPHERSUITE_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384:
+		return tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384
+	case commonpb.Ciphersuite_CIPHERSUITE_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256:
+		return tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256
+	case commonpb.Ciphersuite_CIPHERSUITE_ECDHE_RSA_WITH_AES_128_GCM_SHA256:
+		return tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
+	case commonpb.Ciphersuite_CIPHERSUITE_ECDHE_RSA_WITH_AES_256_GCM_SHA384:
+		return tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
+	case commonpb.Ciphersuite_CIPHERSUITE_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256:
+		return tls.TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256
+	default:
+		return 0xffff
+	}
+}
+
+func getServerConfigFromS2Av2(tokenManager tokenmanager.AccessTokenManager, localIdentities []*commonpbv1.Identity, sni string, s2AStream stream.S2AStream) (*s2av2pb.GetTlsConfigurationResp_ServerTlsConfiguration, error) {
+	authMechanisms := getAuthMechanisms(tokenManager, localIdentities)
+	var locID *commonpbv1.Identity
+	if localIdentities != nil {
+		locID = localIdentities[0]
+	}
+
+	if err := s2AStream.Send(&s2av2pb.SessionReq{
+		LocalIdentity:            locID,
+		AuthenticationMechanisms: authMechanisms,
+		ReqOneof: &s2av2pb.SessionReq_GetTlsConfigurationReq{
+			GetTlsConfigurationReq: &s2av2pb.GetTlsConfigurationReq{
+				ConnectionSide: commonpb.ConnectionSide_CONNECTION_SIDE_SERVER,
+				Sni:            sni,
+			},
+		},
+	}); err != nil {
+		return nil, err
+	}
+
+	resp, err := s2AStream.Recv()
+	if err != nil {
+		return nil, err
+	}
+
+	// TODO(rmehta19): Add unit test for this if statement.
+	if (resp.GetStatus() != nil) && (resp.GetStatus().Code != uint32(codes.OK)) {
+		return nil, fmt.Errorf("failed to get TLS configuration from S2A: %d, %v", resp.GetStatus().Code, resp.GetStatus().Details)
+	}
+
+	return resp.GetGetTlsConfigurationResp().GetServerTlsConfiguration(), nil
+}
+
+func getTLSClientAuthType(tlsConfig *s2av2pb.GetTlsConfigurationResp_ServerTlsConfiguration) tls.ClientAuthType {
+	var clientAuth tls.ClientAuthType
+	switch x := tlsConfig.RequestClientCertificate; x {
+	case s2av2pb.GetTlsConfigurationResp_ServerTlsConfiguration_DONT_REQUEST_CLIENT_CERTIFICATE:
+		clientAuth = tls.NoClientCert
+	case s2av2pb.GetTlsConfigurationResp_ServerTlsConfiguration_REQUEST_CLIENT_CERTIFICATE_BUT_DONT_VERIFY:
+		clientAuth = tls.RequestClientCert
+	case s2av2pb.GetTlsConfigurationResp_ServerTlsConfiguration_REQUEST_CLIENT_CERTIFICATE_AND_VERIFY:
+		// This case actually maps to tls.VerifyClientCertIfGiven. However this
+		// mapping triggers normal verification, followed by custom verification,
+		// specified in VerifyPeerCertificate. To bypass normal verification, and
+		// only do custom verification we set clientAuth to RequireAnyClientCert or
+		// RequestClientCert. See https://github.com/google/s2a-go/pull/43 for full
+		// discussion.
+		clientAuth = tls.RequireAnyClientCert
+	case s2av2pb.GetTlsConfigurationResp_ServerTlsConfiguration_REQUEST_AND_REQUIRE_CLIENT_CERTIFICATE_BUT_DONT_VERIFY:
+		clientAuth = tls.RequireAnyClientCert
+	case s2av2pb.GetTlsConfigurationResp_ServerTlsConfiguration_REQUEST_AND_REQUIRE_CLIENT_CERTIFICATE_AND_VERIFY:
+		// This case actually maps to tls.RequireAndVerifyClientCert. However this
+		// mapping triggers normal verification, followed by custom verification,
+		// specified in VerifyPeerCertificate. To bypass normal verification, and
+		// only do custom verification we set clientAuth to RequireAnyClientCert or
+		// RequestClientCert. See https://github.com/google/s2a-go/pull/43 for full
+		// discussion.
+		clientAuth = tls.RequireAnyClientCert
+	default:
+		clientAuth = tls.RequireAnyClientCert
+	}
+	return clientAuth
+}
+
+func getAuthMechanisms(tokenManager tokenmanager.AccessTokenManager, localIdentities []*commonpbv1.Identity) []*s2av2pb.AuthenticationMechanism {
+	if tokenManager == nil {
+		return nil
+	}
+	if len(localIdentities) == 0 {
+		token, err := tokenManager.DefaultToken()
+		if err != nil {
+			grpclog.Infof("Unable to get token for empty local identity: %v", err)
+			return nil
+		}
+		return []*s2av2pb.AuthenticationMechanism{
+			{
+				MechanismOneof: &s2av2pb.AuthenticationMechanism_Token{
+					Token: token,
+				},
+			},
+		}
+	}
+	var authMechanisms []*s2av2pb.AuthenticationMechanism
+	for _, localIdentity := range localIdentities {
+		if localIdentity == nil {
+			token, err := tokenManager.DefaultToken()
+			if err != nil {
+				grpclog.Infof("Unable to get default token for local identity %v: %v", localIdentity, err)
+				continue
+			}
+			authMechanisms = append(authMechanisms, &s2av2pb.AuthenticationMechanism{
+				Identity: localIdentity,
+				MechanismOneof: &s2av2pb.AuthenticationMechanism_Token{
+					Token: token,
+				},
+			})
+		} else {
+			token, err := tokenManager.Token(localIdentity)
+			if err != nil {
+				grpclog.Infof("Unable to get token for local identity %v: %v", localIdentity, err)
+				continue
+			}
+			authMechanisms = append(authMechanisms, &s2av2pb.AuthenticationMechanism{
+				Identity: localIdentity,
+				MechanismOneof: &s2av2pb.AuthenticationMechanism_Token{
+					Token: token,
+				},
+			})
+		}
+	}
+	return authMechanisms
+}
+
+// TODO(rmehta19): refactor switch statements into a helper function.
+func getTLSMinMaxVersionsClient(tlsConfig *s2av2pb.GetTlsConfigurationResp_ClientTlsConfiguration) (uint16, uint16, error) {
+	// Map S2Av2 TLSVersion to consts defined in tls package.
+	var minVersion uint16
+	var maxVersion uint16
+	switch x := tlsConfig.MinTlsVersion; x {
+	case commonpb.TLSVersion_TLS_VERSION_1_0:
+		minVersion = tls.VersionTLS10
+	case commonpb.TLSVersion_TLS_VERSION_1_1:
+		minVersion = tls.VersionTLS11
+	case commonpb.TLSVersion_TLS_VERSION_1_2:
+		minVersion = tls.VersionTLS12
+	case commonpb.TLSVersion_TLS_VERSION_1_3:
+		minVersion = tls.VersionTLS13
+	default:
+		return minVersion, maxVersion, fmt.Errorf("S2Av2 provided invalid MinTlsVersion: %v", x)
+	}
+
+	switch x := tlsConfig.MaxTlsVersion; x {
+	case commonpb.TLSVersion_TLS_VERSION_1_0:
+		maxVersion = tls.VersionTLS10
+	case commonpb.TLSVersion_TLS_VERSION_1_1:
+		maxVersion = tls.VersionTLS11
+	case commonpb.TLSVersion_TLS_VERSION_1_2:
+		maxVersion = tls.VersionTLS12
+	case commonpb.TLSVersion_TLS_VERSION_1_3:
+		maxVersion = tls.VersionTLS13
+	default:
+		return minVersion, maxVersion, fmt.Errorf("S2Av2 provided invalid MaxTlsVersion: %v", x)
+	}
+	if minVersion > maxVersion {
+		return minVersion, maxVersion, errors.New("S2Av2 provided minVersion > maxVersion")
+	}
+	return minVersion, maxVersion, nil
+}
+
+func getTLSMinMaxVersionsServer(tlsConfig *s2av2pb.GetTlsConfigurationResp_ServerTlsConfiguration) (uint16, uint16, error) {
+	// Map S2Av2 TLSVersion to consts defined in tls package.
+	var minVersion uint16
+	var maxVersion uint16
+	switch x := tlsConfig.MinTlsVersion; x {
+	case commonpb.TLSVersion_TLS_VERSION_1_0:
+		minVersion = tls.VersionTLS10
+	case commonpb.TLSVersion_TLS_VERSION_1_1:
+		minVersion = tls.VersionTLS11
+	case commonpb.TLSVersion_TLS_VERSION_1_2:
+		minVersion = tls.VersionTLS12
+	case commonpb.TLSVersion_TLS_VERSION_1_3:
+		minVersion = tls.VersionTLS13
+	default:
+		return minVersion, maxVersion, fmt.Errorf("S2Av2 provided invalid MinTlsVersion: %v", x)
+	}
+
+	switch x := tlsConfig.MaxTlsVersion; x {
+	case commonpb.TLSVersion_TLS_VERSION_1_0:
+		maxVersion = tls.VersionTLS10
+	case commonpb.TLSVersion_TLS_VERSION_1_1:
+		maxVersion = tls.VersionTLS11
+	case commonpb.TLSVersion_TLS_VERSION_1_2:
+		maxVersion = tls.VersionTLS12
+	case commonpb.TLSVersion_TLS_VERSION_1_3:
+		maxVersion = tls.VersionTLS13
+	default:
+		return minVersion, maxVersion, fmt.Errorf("S2Av2 provided invalid MaxTlsVersion: %v", x)
+	}
+	if minVersion > maxVersion {
+		return minVersion, maxVersion, errors.New("S2Av2 provided minVersion > maxVersion")
+	}
+	return minVersion, maxVersion, nil
+}