open-consul/agent/proxycfg/terminating_gateway.go

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// Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: MPL-2.0
package proxycfg
import (
"context"
"fmt"
"strings"
cachetype "github.com/hashicorp/consul/agent/cache-types"
"github.com/hashicorp/consul/agent/structs"
)
type handlerTerminatingGateway struct {
handlerState
}
// initialize sets up the initial watches needed based on the terminating-gateway registration
func (s *handlerTerminatingGateway) initialize(ctx context.Context) (ConfigSnapshot, error) {
snap := newConfigSnapshotFromServiceInstance(s.serviceInstance, s.stateConfig)
// Watch for root changes
err := s.dataSources.CARoots.Notify(ctx, &structs.DCSpecificRequest{
Datacenter: s.source.Datacenter,
QueryOptions: structs.QueryOptions{Token: s.token},
Source: *s.source,
}, rootsWatchID, s.ch)
if err != nil {
s.logger.Error("failed to register watch for root changes", "error", err)
return snap, err
}
// Get information about the entire service mesh.
err = s.dataSources.ConfigEntry.Notify(ctx, &structs.ConfigEntryQuery{
Kind: structs.MeshConfig,
Name: structs.MeshConfigMesh,
Datacenter: s.source.Datacenter,
QueryOptions: structs.QueryOptions{Token: s.token},
EnterpriseMeta: *structs.DefaultEnterpriseMetaInPartition(s.proxyID.PartitionOrDefault()),
}, meshConfigEntryID, s.ch)
if err != nil {
return snap, err
}
// Watch for the terminating-gateway's linked services
err = s.dataSources.GatewayServices.Notify(ctx, &structs.ServiceSpecificRequest{
Datacenter: s.source.Datacenter,
QueryOptions: structs.QueryOptions{Token: s.token},
ServiceName: s.service,
EnterpriseMeta: s.proxyID.EnterpriseMeta,
}, gatewayServicesWatchID, s.ch)
if err != nil {
s.logger.Error("failed to register watch for linked services", "error", err)
return snap, err
}
snap.TerminatingGateway.WatchedServices = make(map[structs.ServiceName]context.CancelFunc)
snap.TerminatingGateway.WatchedIntentions = make(map[structs.ServiceName]context.CancelFunc)
snap.TerminatingGateway.Intentions = make(map[structs.ServiceName]structs.Intentions)
snap.TerminatingGateway.WatchedLeaves = make(map[structs.ServiceName]context.CancelFunc)
snap.TerminatingGateway.ServiceLeaves = make(map[structs.ServiceName]*structs.IssuedCert)
snap.TerminatingGateway.WatchedConfigs = make(map[structs.ServiceName]context.CancelFunc)
snap.TerminatingGateway.ServiceConfigs = make(map[structs.ServiceName]*structs.ServiceConfigResponse)
snap.TerminatingGateway.WatchedResolvers = make(map[structs.ServiceName]context.CancelFunc)
snap.TerminatingGateway.ServiceResolvers = make(map[structs.ServiceName]*structs.ServiceResolverConfigEntry)
snap.TerminatingGateway.ServiceResolversSet = make(map[structs.ServiceName]bool)
snap.TerminatingGateway.ServiceGroups = make(map[structs.ServiceName]structs.CheckServiceNodes)
snap.TerminatingGateway.GatewayServices = make(map[structs.ServiceName]structs.GatewayService)
snap.TerminatingGateway.DestinationServices = make(map[structs.ServiceName]structs.GatewayService)
snap.TerminatingGateway.HostnameServices = make(map[structs.ServiceName]structs.CheckServiceNodes)
return snap, nil
}
func (s *handlerTerminatingGateway) handleUpdate(ctx context.Context, u UpdateEvent, snap *ConfigSnapshot) error {
if u.Err != nil {
return fmt.Errorf("error filling agent cache: %v", u.Err)
}
logger := s.logger
switch {
case u.CorrelationID == rootsWatchID:
roots, ok := u.Result.(*structs.IndexedCARoots)
if !ok {
return fmt.Errorf("invalid type for response: %T", u.Result)
}
snap.Roots = roots
case u.CorrelationID == meshConfigEntryID:
resp, ok := u.Result.(*structs.ConfigEntryResponse)
if !ok {
return fmt.Errorf("invalid type for response: %T", u.Result)
}
if resp.Entry != nil {
meshConf, ok := resp.Entry.(*structs.MeshConfigEntry)
if !ok {
return fmt.Errorf("invalid type for config entry: %T", resp.Entry)
}
snap.TerminatingGateway.MeshConfig = meshConf
} else {
snap.TerminatingGateway.MeshConfig = nil
}
snap.TerminatingGateway.MeshConfigSet = true
// Update watches based on the current list of services associated with the terminating-gateway
case u.CorrelationID == gatewayServicesWatchID:
services, ok := u.Result.(*structs.IndexedGatewayServices)
if !ok {
return fmt.Errorf("invalid type for response: %T", u.Result)
}
svcMap := make(map[structs.ServiceName]struct{})
for _, svc := range services.Services {
// Make sure to add every service to this map, we use it to cancel watches below.
svcMap[svc.Service] = struct{}{}
// Store the gateway <-> service mapping for TLS origination
if svc.ServiceKind == structs.GatewayServiceKindDestination {
snap.TerminatingGateway.DestinationServices[svc.Service] = *svc
} else {
snap.TerminatingGateway.GatewayServices[svc.Service] = *svc
}
// Watch the health endpoint to discover endpoints for the service
if _, ok := snap.TerminatingGateway.WatchedServices[svc.Service]; !ok && !(svc.ServiceKind == structs.GatewayServiceKindDestination) {
ctx, cancel := context.WithCancel(ctx)
err := s.dataSources.Health.Notify(ctx, &structs.ServiceSpecificRequest{
Datacenter: s.source.Datacenter,
QueryOptions: structs.QueryOptions{Token: s.token},
ServiceName: svc.Service.Name,
EnterpriseMeta: svc.Service.EnterpriseMeta,
// The gateway acts as the service's proxy, so we do NOT want to discover other proxies
Connect: false,
}, externalServiceIDPrefix+svc.Service.String(), s.ch)
if err != nil {
logger.Error("failed to register watch for external-service",
"service", svc.Service.String(),
"error", err,
)
cancel()
return err
}
snap.TerminatingGateway.WatchedServices[svc.Service] = cancel
}
// Watch intentions with this service as their destination
// The gateway will enforce intentions for connections to the service
if _, ok := snap.TerminatingGateway.WatchedIntentions[svc.Service]; !ok {
ctx, cancel := context.WithCancel(ctx)
err := s.dataSources.Intentions.Notify(ctx, &structs.ServiceSpecificRequest{
Datacenter: s.source.Datacenter,
QueryOptions: structs.QueryOptions{Token: s.token},
EnterpriseMeta: svc.Service.EnterpriseMeta,
ServiceName: svc.Service.Name,
}, serviceIntentionsIDPrefix+svc.Service.String(), s.ch)
if err != nil {
logger.Error("failed to register watch for service-intentions",
"service", svc.Service.String(),
"error", err,
)
cancel()
return err
}
snap.TerminatingGateway.WatchedIntentions[svc.Service] = cancel
}
// Watch leaf certificate for the service
// This cert is used to terminate mTLS connections on the service's behalf
if _, ok := snap.TerminatingGateway.WatchedLeaves[svc.Service]; !ok {
ctx, cancel := context.WithCancel(ctx)
err := s.dataSources.LeafCertificate.Notify(ctx, &cachetype.ConnectCALeafRequest{
Datacenter: s.source.Datacenter,
Token: s.token,
Service: svc.Service.Name,
EnterpriseMeta: svc.Service.EnterpriseMeta,
}, serviceLeafIDPrefix+svc.Service.String(), s.ch)
if err != nil {
logger.Error("failed to register watch for a service-leaf",
"service", svc.Service.String(),
"error", err,
)
cancel()
return err
}
snap.TerminatingGateway.WatchedLeaves[svc.Service] = cancel
}
// Watch service configs for the service.
// These are used to determine the protocol for the target service.
if _, ok := snap.TerminatingGateway.WatchedConfigs[svc.Service]; !ok {
ctx, cancel := context.WithCancel(ctx)
err := s.dataSources.ResolvedServiceConfig.Notify(ctx, &structs.ServiceConfigRequest{
Datacenter: s.source.Datacenter,
QueryOptions: structs.QueryOptions{Token: s.token},
Name: svc.Service.Name,
EnterpriseMeta: svc.Service.EnterpriseMeta,
}, serviceConfigIDPrefix+svc.Service.String(), s.ch)
if err != nil {
logger.Error("failed to register watch for a resolved service config",
"service", svc.Service.String(),
"error", err,
)
cancel()
return err
}
snap.TerminatingGateway.WatchedConfigs[svc.Service] = cancel
}
// Watch service resolvers for the service
// These are used to create clusters and endpoints for the service subsets
if _, ok := snap.TerminatingGateway.WatchedResolvers[svc.Service]; !ok && !(svc.ServiceKind == structs.GatewayServiceKindDestination) {
ctx, cancel := context.WithCancel(ctx)
err := s.dataSources.ConfigEntry.Notify(ctx, &structs.ConfigEntryQuery{
Datacenter: s.source.Datacenter,
QueryOptions: structs.QueryOptions{Token: s.token},
Kind: structs.ServiceResolver,
Name: svc.Service.Name,
EnterpriseMeta: svc.Service.EnterpriseMeta,
}, serviceResolverIDPrefix+svc.Service.String(), s.ch)
if err != nil {
logger.Error("failed to register watch for a service-resolver",
"service", svc.Service.String(),
"error", err,
)
cancel()
return err
}
snap.TerminatingGateway.WatchedResolvers[svc.Service] = cancel
}
}
// Delete gateway service mapping for services that were not in the update
for sn := range snap.TerminatingGateway.GatewayServices {
if _, ok := svcMap[sn]; !ok {
delete(snap.TerminatingGateway.GatewayServices, sn)
}
}
// Delete endpoint service mapping for services that were not in the update
for sn := range snap.TerminatingGateway.DestinationServices {
if _, ok := svcMap[sn]; !ok {
delete(snap.TerminatingGateway.DestinationServices, sn)
}
}
// Clean up services with hostname mapping for services that were not in the update
for sn := range snap.TerminatingGateway.HostnameServices {
if _, ok := svcMap[sn]; !ok {
delete(snap.TerminatingGateway.HostnameServices, sn)
}
}
// Cancel service instance watches for services that were not in the update
for sn, cancelFn := range snap.TerminatingGateway.WatchedServices {
if _, ok := svcMap[sn]; !ok {
logger.Debug("canceling watch for service", "service", sn.String())
delete(snap.TerminatingGateway.WatchedServices, sn)
delete(snap.TerminatingGateway.ServiceGroups, sn)
cancelFn()
}
}
// Cancel leaf cert watches for services that were not in the update
for sn, cancelFn := range snap.TerminatingGateway.WatchedLeaves {
if _, ok := svcMap[sn]; !ok {
logger.Debug("canceling watch for leaf cert", "service", sn.String())
delete(snap.TerminatingGateway.WatchedLeaves, sn)
delete(snap.TerminatingGateway.ServiceLeaves, sn)
cancelFn()
}
}
// Cancel service config watches for services that were not in the update
for sn, cancelFn := range snap.TerminatingGateway.WatchedConfigs {
if _, ok := svcMap[sn]; !ok {
logger.Debug("canceling watch for resolved service config", "service", sn.String())
delete(snap.TerminatingGateway.WatchedConfigs, sn)
delete(snap.TerminatingGateway.ServiceConfigs, sn)
cancelFn()
}
}
// Cancel service-resolver watches for services that were not in the update
for sn, cancelFn := range snap.TerminatingGateway.WatchedResolvers {
if _, ok := svcMap[sn]; !ok {
logger.Debug("canceling watch for service-resolver", "service", sn.String())
delete(snap.TerminatingGateway.WatchedResolvers, sn)
delete(snap.TerminatingGateway.ServiceResolvers, sn)
delete(snap.TerminatingGateway.ServiceResolversSet, sn)
cancelFn()
}
}
// Cancel intention watches for services that were not in the update
for sn, cancelFn := range snap.TerminatingGateway.WatchedIntentions {
if _, ok := svcMap[sn]; !ok {
logger.Debug("canceling watch for intention", "service", sn.String())
delete(snap.TerminatingGateway.WatchedIntentions, sn)
delete(snap.TerminatingGateway.Intentions, sn)
cancelFn()
}
}
case strings.HasPrefix(u.CorrelationID, externalServiceIDPrefix):
resp, ok := u.Result.(*structs.IndexedCheckServiceNodes)
if !ok {
return fmt.Errorf("invalid type for response: %T", u.Result)
}
sn := structs.ServiceNameFromString(strings.TrimPrefix(u.CorrelationID, externalServiceIDPrefix))
delete(snap.TerminatingGateway.ServiceGroups, sn)
delete(snap.TerminatingGateway.HostnameServices, sn)
if len(resp.Nodes) > 0 {
snap.TerminatingGateway.ServiceGroups[sn] = resp.Nodes
snap.TerminatingGateway.HostnameServices[sn] = hostnameEndpoints(
2021-10-29 00:41:48 +00:00
s.logger,
snap.Locality,
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resp.Nodes,
)
}
// Store leaf cert for watched service
case strings.HasPrefix(u.CorrelationID, serviceLeafIDPrefix):
leaf, ok := u.Result.(*structs.IssuedCert)
if !ok {
return fmt.Errorf("invalid type for response: %T", u.Result)
}
sn := structs.ServiceNameFromString(strings.TrimPrefix(u.CorrelationID, serviceLeafIDPrefix))
snap.TerminatingGateway.ServiceLeaves[sn] = leaf
case strings.HasPrefix(u.CorrelationID, serviceConfigIDPrefix):
serviceConfig, ok := u.Result.(*structs.ServiceConfigResponse)
if !ok {
return fmt.Errorf("invalid type for response: %T", u.Result)
}
sn := structs.ServiceNameFromString(strings.TrimPrefix(u.CorrelationID, serviceConfigIDPrefix))
snap.TerminatingGateway.ServiceConfigs[sn] = serviceConfig
case strings.HasPrefix(u.CorrelationID, serviceResolverIDPrefix):
resp, ok := u.Result.(*structs.ConfigEntryResponse)
if !ok {
return fmt.Errorf("invalid type for response: %T", u.Result)
}
sn := structs.ServiceNameFromString(strings.TrimPrefix(u.CorrelationID, serviceResolverIDPrefix))
// There should only ever be one entry for a service resolver within a namespace
if resolver, ok := resp.Entry.(*structs.ServiceResolverConfigEntry); ok {
snap.TerminatingGateway.ServiceResolvers[sn] = resolver
snap.TerminatingGateway.ServiceResolversSet[sn] = true
} else {
// we likely have a deleted service resolver, and our cast is a nil
// cast, so clear this out
delete(snap.TerminatingGateway.ServiceResolvers, sn)
snap.TerminatingGateway.ServiceResolversSet[sn] = false
}
case strings.HasPrefix(u.CorrelationID, serviceIntentionsIDPrefix):
resp, ok := u.Result.(structs.Intentions)
if !ok {
return fmt.Errorf("invalid type for response: %T", u.Result)
}
sn := structs.ServiceNameFromString(strings.TrimPrefix(u.CorrelationID, serviceIntentionsIDPrefix))
snap.TerminatingGateway.Intentions[sn] = resp
default:
// do nothing
}
return nil
}