mirror of
https://github.com/rocky-linux/peridot.git
synced 2024-11-24 22:21:25 +00:00
129 lines
3.9 KiB
Go
129 lines
3.9 KiB
Go
/*
|
|
*
|
|
* Copyright 2021 gRPC authors.
|
|
*
|
|
* 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
|
|
*
|
|
* http://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 google
|
|
|
|
import (
|
|
"context"
|
|
"net"
|
|
"net/url"
|
|
"strings"
|
|
|
|
"google.golang.org/grpc/credentials"
|
|
"google.golang.org/grpc/internal/xds"
|
|
)
|
|
|
|
const cfeClusterNamePrefix = "google_cfe_"
|
|
const cfeClusterResourceNamePrefix = "/envoy.config.cluster.v3.Cluster/google_cfe_"
|
|
const cfeClusterAuthorityName = "traffic-director-c2p.xds.googleapis.com"
|
|
|
|
// clusterTransportCreds is a combo of TLS + ALTS.
|
|
//
|
|
// On the client, ClientHandshake picks TLS or ALTS based on address attributes.
|
|
// - if attributes has cluster name
|
|
// - if cluster name has prefix "google_cfe_", or
|
|
// "xdstp://traffic-director-c2p.xds.googleapis.com/envoy.config.cluster.v3.Cluster/google_cfe_",
|
|
// use TLS
|
|
// - otherwise, use ALTS
|
|
//
|
|
// - else, do TLS
|
|
//
|
|
// On the server, ServerHandshake always does TLS.
|
|
type clusterTransportCreds struct {
|
|
tls credentials.TransportCredentials
|
|
alts credentials.TransportCredentials
|
|
}
|
|
|
|
func newClusterTransportCreds(tls, alts credentials.TransportCredentials) *clusterTransportCreds {
|
|
return &clusterTransportCreds{
|
|
tls: tls,
|
|
alts: alts,
|
|
}
|
|
}
|
|
|
|
// clusterName returns the xDS cluster name stored in the attributes in the
|
|
// context.
|
|
func clusterName(ctx context.Context) string {
|
|
chi := credentials.ClientHandshakeInfoFromContext(ctx)
|
|
if chi.Attributes == nil {
|
|
return ""
|
|
}
|
|
cluster, _ := xds.GetXDSHandshakeClusterName(chi.Attributes)
|
|
return cluster
|
|
}
|
|
|
|
// isDirectPathCluster returns true if the cluster in the context is a
|
|
// directpath cluster, meaning ALTS should be used.
|
|
func isDirectPathCluster(ctx context.Context) bool {
|
|
cluster := clusterName(ctx)
|
|
if cluster == "" {
|
|
// No cluster; not xDS; use TLS.
|
|
return false
|
|
}
|
|
if strings.HasPrefix(cluster, cfeClusterNamePrefix) {
|
|
// xDS cluster prefixed by "google_cfe_"; use TLS.
|
|
return false
|
|
}
|
|
if !strings.HasPrefix(cluster, "xdstp:") {
|
|
// Other xDS cluster name; use ALTS.
|
|
return true
|
|
}
|
|
u, err := url.Parse(cluster)
|
|
if err != nil {
|
|
// Shouldn't happen, but assume ALTS.
|
|
return true
|
|
}
|
|
// If authority AND path match our CFE checks, use TLS; otherwise use ALTS.
|
|
return u.Host != cfeClusterAuthorityName || !strings.HasPrefix(u.Path, cfeClusterResourceNamePrefix)
|
|
}
|
|
|
|
func (c *clusterTransportCreds) ClientHandshake(ctx context.Context, authority string, rawConn net.Conn) (net.Conn, credentials.AuthInfo, error) {
|
|
if isDirectPathCluster(ctx) {
|
|
// If attributes have cluster name, and cluster name is not cfe, it's a
|
|
// backend address, use ALTS.
|
|
return c.alts.ClientHandshake(ctx, authority, rawConn)
|
|
}
|
|
return c.tls.ClientHandshake(ctx, authority, rawConn)
|
|
}
|
|
|
|
func (c *clusterTransportCreds) ServerHandshake(conn net.Conn) (net.Conn, credentials.AuthInfo, error) {
|
|
return c.tls.ServerHandshake(conn)
|
|
}
|
|
|
|
func (c *clusterTransportCreds) Info() credentials.ProtocolInfo {
|
|
// TODO: this always returns tls.Info now, because we don't have a cluster
|
|
// name to check when this method is called. This method doesn't affect
|
|
// anything important now. We may want to revisit this if it becomes more
|
|
// important later.
|
|
return c.tls.Info()
|
|
}
|
|
|
|
func (c *clusterTransportCreds) Clone() credentials.TransportCredentials {
|
|
return &clusterTransportCreds{
|
|
tls: c.tls.Clone(),
|
|
alts: c.alts.Clone(),
|
|
}
|
|
}
|
|
|
|
func (c *clusterTransportCreds) OverrideServerName(s string) error {
|
|
if err := c.tls.OverrideServerName(s); err != nil {
|
|
return err
|
|
}
|
|
return c.alts.OverrideServerName(s)
|
|
}
|