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server.go
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server.go
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package server
import (
"context"
"crypto/tls"
"fmt"
"net"
"time"
"github.com/dapr/dapr/pkg/logger"
pb "github.com/dapr/dapr/pkg/proto/sentry"
"github.com/dapr/dapr/pkg/sentry/ca"
"github.com/dapr/dapr/pkg/sentry/certs"
"github.com/dapr/dapr/pkg/sentry/csr"
"github.com/dapr/dapr/pkg/sentry/identity"
"github.com/dapr/dapr/pkg/sentry/monitoring"
"github.com/golang/protobuf/ptypes"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
)
const (
serverCertExpiryBuffer = time.Minute * 15
)
var log = logger.NewLogger("dapr.sentry.server")
// CAServer is an interface for the Certificate Authority server
type CAServer interface {
Run(port int, trustBundle ca.TrustRootBundler) error
Shutdown()
}
type server struct {
certificate *tls.Certificate
certAuth ca.CertificateAuthority
srv *grpc.Server
validator identity.Validator
}
// NewCAServer returns a new CA Server running a gRPC server
func NewCAServer(ca ca.CertificateAuthority, validator identity.Validator) CAServer {
return &server{
certAuth: ca,
validator: validator,
}
}
// Run starts a secured gRPC server for the Sentry Certificate Authority.
// It enforces client side cert validation using the trust root cert.
func (s *server) Run(port int, trustBundler ca.TrustRootBundler) error {
addr := fmt.Sprintf(":%v", port)
lis, err := net.Listen("tcp", addr)
if err != nil {
return fmt.Errorf("could not listen on %s: %s", addr, err)
}
tlsOpt := s.tlsServerOption(trustBundler)
s.srv = grpc.NewServer(tlsOpt)
pb.RegisterCAServer(s.srv, s)
if err := s.srv.Serve(lis); err != nil {
return fmt.Errorf("grpc serve error: %s", err)
}
return nil
}
func (s *server) tlsServerOption(trustBundler ca.TrustRootBundler) grpc.ServerOption {
cp := trustBundler.GetTrustAnchors()
config := &tls.Config{
ClientCAs: cp,
// Require cert verification
ClientAuth: tls.VerifyClientCertIfGiven,
GetCertificate: func(*tls.ClientHelloInfo) (*tls.Certificate, error) {
if s.certificate == nil || needsRefresh(s.certificate, serverCertExpiryBuffer) {
cert, err := s.getServerCertificate()
if err != nil {
monitoring.ServerCertIssueFailed("server_cert")
log.Error(err)
return nil, fmt.Errorf("failed to get TLS server certificate: %s", err)
}
s.certificate = cert
}
return s.certificate, nil
},
}
return grpc.Creds(credentials.NewTLS(config))
}
func (s *server) getServerCertificate() (*tls.Certificate, error) {
csrPem, pkPem, err := csr.GenerateCSR("", false)
if err != nil {
return nil, err
}
now := time.Now().UTC()
issuerExp := s.certAuth.GetCACertBundle().GetIssuerCertExpiry()
serverCertTTL := issuerExp.Sub(now)
resp, err := s.certAuth.SignCSR(csrPem, s.certAuth.GetCACertBundle().GetTrustDomain(), serverCertTTL, false)
if err != nil {
return nil, err
}
certPem := resp.CertPEM
certPem = append(certPem, s.certAuth.GetCACertBundle().GetIssuerCertPem()...)
certPem = append(certPem, s.certAuth.GetCACertBundle().GetRootCertPem()...)
cert, err := tls.X509KeyPair(certPem, pkPem)
if err != nil {
return nil, err
}
return &cert, nil
}
// SignCertificate handles CSR requests originating from Dapr sidecars.
// The method receives a request with an identity and initial cert and returns
// A signed certificate including the trust chain to the caller along with an expiry date.
func (s *server) SignCertificate(ctx context.Context, req *pb.SignCertificateRequest) (*pb.SignCertificateResponse, error) {
monitoring.CertSignRequestRecieved()
csrPem := req.GetCertificateSigningRequest()
csr, err := certs.ParsePemCSR(csrPem)
if err != nil {
err = fmt.Errorf("cannot parse certificate signing request pem: %s", err)
log.Error(err)
monitoring.CertSignFailed("cert_parse")
return nil, err
}
err = s.certAuth.ValidateCSR(csr)
if err != nil {
err = fmt.Errorf("error validating csr: %s", err)
log.Error(err)
monitoring.CertSignFailed("cert_validation")
return nil, err
}
err = s.validator.Validate(req.GetId(), req.GetToken())
if err != nil {
err = fmt.Errorf("error validating requester identity: %s", err)
log.Error(err)
monitoring.CertSignFailed("req_id_validation")
return nil, err
}
signed, err := s.certAuth.SignCSR(csrPem, csr.Subject.CommonName, -1, false)
if err != nil {
err = fmt.Errorf("error signing csr: %s", err)
log.Error(err)
monitoring.CertSignFailed("cert_sign")
return nil, err
}
certPem := signed.CertPEM
issuerCert := s.certAuth.GetCACertBundle().GetIssuerCertPem()
rootCert := s.certAuth.GetCACertBundle().GetRootCertPem()
certPem = append(certPem, issuerCert...)
certPem = append(certPem, rootCert...)
if len(certPem) == 0 {
err = fmt.Errorf("insufficient data in certificate signing request, no certs signed")
log.Error(err)
monitoring.CertSignFailed("insufficient_data")
return nil, err
}
expiry, err := ptypes.TimestampProto(signed.Certificate.NotAfter)
if err != nil {
return nil, fmt.Errorf("could not validate certificate validity: %s", err)
}
resp := &pb.SignCertificateResponse{
WorkloadCertificate: certPem,
TrustChainCertificates: [][]byte{issuerCert, rootCert},
ValidUntil: expiry,
}
monitoring.CertSignSucceed()
return resp, nil
}
func (s *server) Shutdown() {
s.srv.Stop()
}
func needsRefresh(cert *tls.Certificate, expiryBuffer time.Duration) bool {
leaf := cert.Leaf
if leaf == nil {
return true
}
// Check if the leaf certificate is about to expire.
return leaf.NotAfter.Add(-serverCertExpiryBuffer).Before(time.Now().UTC())
}