/
secret.go
162 lines (129 loc) · 4.17 KB
/
secret.go
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package authorize
import (
"context"
"crypto/tls"
"crypto/x509"
"errors"
"fmt"
"net"
"time"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
"github.com/SKF/go-enlight-sdk/v2/services/authorize/credentialsmanager"
)
const CertificateGracePeriod = 24 * time.Hour
func getCredentialOption(ctx context.Context, host, secretKeyName string, cf credentialsmanager.CredentialsFetcher) (grpc.DialOption, error) {
c, err := NewAutoRefreshingTransportCredentials(ctx, cf, secretKeyName, host)
if err != nil {
return nil, err
}
return grpc.WithTransportCredentials(c), nil
}
type autoRefreshingTransportCredentials struct {
credentials credentials.TransportCredentials
cf credentialsmanager.CredentialsFetcher
secretKeyName string
serverName string
certificateExpiryTime time.Time
}
func NewAutoRefreshingTransportCredentials(ctx context.Context, cf credentialsmanager.CredentialsFetcher, secretKeyName, host string) (credentials.TransportCredentials, error) {
creds := &autoRefreshingTransportCredentials{
cf: cf,
secretKeyName: secretKeyName,
serverName: host,
}
err := creds.loadCertificates(ctx)
if err != nil {
return nil, err
}
return creds, nil
}
func (c *autoRefreshingTransportCredentials) ensureValidCredentials(ctx context.Context) error {
if !c.shouldLoadNewCertificates() {
return nil
}
if err := c.loadCertificates(ctx); err != nil {
return err
}
return nil
}
func (c *autoRefreshingTransportCredentials) shouldLoadNewCertificates() bool {
earliestReload := c.certificateExpiryTime.Add(-CertificateGracePeriod)
return time.Now().After(earliestReload)
}
func (c *autoRefreshingTransportCredentials) loadCertificates(ctx context.Context) error {
config, err := c.loadCertificateIntoConfig(ctx)
if err != nil {
return err
}
var expiryTime time.Time
for _, chain := range config.Certificates {
for _, certificate := range chain.Certificate {
var parsedCertificate *x509.Certificate
if parsedCertificate, err = x509.ParseCertificate(certificate); err != nil {
return err
}
t := parsedCertificate.NotAfter
if expiryTime == (time.Time{}) || t.Before(expiryTime) {
expiryTime = t
}
}
}
c.credentials = credentials.NewTLS(config)
c.certificateExpiryTime = expiryTime
return nil
}
func (c *autoRefreshingTransportCredentials) loadCertificateIntoConfig(ctx context.Context) (*tls.Config, error) {
secrets, err := c.cf.GetDataStore(ctx, c.secretKeyName)
if err != nil {
return nil, err
}
certificate, err := tls.X509KeyPair(secrets.Crt, secrets.Key)
if err != nil {
return nil, fmt.Errorf("failed to load client certs: %w", err)
}
certPool := x509.NewCertPool()
ok := certPool.AppendCertsFromPEM(secrets.CA)
if !ok {
return nil, errors.New("failed to append certs")
}
return &tls.Config{
ServerName: c.serverName,
Certificates: []tls.Certificate{certificate},
RootCAs: certPool,
}, nil
}
func (c *autoRefreshingTransportCredentials) ClientHandshake(ctx context.Context, s string, conn net.Conn) (net.Conn, credentials.AuthInfo, error) {
if err := c.ensureValidCredentials(ctx); err != nil {
return nil, nil, err
}
return c.credentials.ClientHandshake(ctx, s, conn)
}
func (c *autoRefreshingTransportCredentials) ServerHandshake(conn net.Conn) (net.Conn, credentials.AuthInfo, error) {
if err := c.ensureValidCredentials(context.Background()); err != nil {
return nil, nil, err
}
return c.credentials.ServerHandshake(conn)
}
func (c *autoRefreshingTransportCredentials) Info() credentials.ProtocolInfo {
if c.credentials == nil {
return credentials.ProtocolInfo{}
}
return c.credentials.Info()
}
func (c *autoRefreshingTransportCredentials) Clone() credentials.TransportCredentials {
return &autoRefreshingTransportCredentials{
credentials: c.credentials.Clone(),
cf: c.cf,
secretKeyName: c.secretKeyName,
serverName: c.serverName,
certificateExpiryTime: c.certificateExpiryTime,
}
}
func (c *autoRefreshingTransportCredentials) OverrideServerName(s string) error {
if c.credentials == nil {
return nil
}
//nolint:staticcheck
return c.credentials.OverrideServerName(s)
}