open-consul/agent/proxycfg/ingress_gateway.go

257 lines
8.4 KiB
Go

package proxycfg
import (
"context"
"fmt"
"github.com/hashicorp/consul/agent/cache"
cachetype "github.com/hashicorp/consul/agent/cache-types"
"github.com/hashicorp/consul/agent/structs"
)
type handlerIngressGateway struct {
handlerState
}
func (s *handlerIngressGateway) initialize(ctx context.Context) (ConfigSnapshot, error) {
snap := newConfigSnapshotFromServiceInstance(s.serviceInstance, s.stateConfig)
// Watch for root changes
err := s.cache.Notify(ctx, cachetype.ConnectCARootName, &structs.DCSpecificRequest{
Datacenter: s.source.Datacenter,
QueryOptions: structs.QueryOptions{Token: s.token},
Source: *s.source,
}, rootsWatchID, s.ch)
if err != nil {
return snap, err
}
// Watch this ingress gateway's config entry
err = s.cache.Notify(ctx, cachetype.ConfigEntryName, &structs.ConfigEntryQuery{
Kind: structs.IngressGateway,
Name: s.service,
Datacenter: s.source.Datacenter,
QueryOptions: structs.QueryOptions{Token: s.token},
EnterpriseMeta: s.proxyID.EnterpriseMeta,
}, gatewayConfigWatchID, s.ch)
if err != nil {
return snap, err
}
// Watch the ingress-gateway's list of upstreams
err = s.cache.Notify(ctx, cachetype.GatewayServicesName, &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 {
return snap, err
}
snap.IngressGateway.WatchedDiscoveryChains = make(map[string]context.CancelFunc)
snap.IngressGateway.DiscoveryChain = make(map[string]*structs.CompiledDiscoveryChain)
snap.IngressGateway.WatchedUpstreams = make(map[string]map[string]context.CancelFunc)
snap.IngressGateway.WatchedUpstreamEndpoints = make(map[string]map[string]structs.CheckServiceNodes)
snap.IngressGateway.WatchedGateways = make(map[string]map[string]context.CancelFunc)
snap.IngressGateway.WatchedGatewayEndpoints = make(map[string]map[string]structs.CheckServiceNodes)
snap.IngressGateway.Listeners = make(map[IngressListenerKey]structs.IngressListener)
return snap, nil
}
func (s *handlerIngressGateway) handleUpdate(ctx context.Context, u cache.UpdateEvent, snap *ConfigSnapshot) error {
if u.Err != nil {
return fmt.Errorf("error filling agent cache: %v", u.Err)
}
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 == gatewayConfigWatchID:
resp, ok := u.Result.(*structs.ConfigEntryResponse)
if !ok {
return fmt.Errorf("invalid type for response: %T", u.Result)
}
gatewayConf, ok := resp.Entry.(*structs.IngressGatewayConfigEntry)
if !ok {
return fmt.Errorf("invalid type for config entry: %T", resp.Entry)
}
snap.IngressGateway.GatewayConfigLoaded = true
snap.IngressGateway.TLSConfig = gatewayConf.TLS
// Load each listener's config from the config entry so we don't have to
// pass listener config through "upstreams" types as that grows.
for _, l := range gatewayConf.Listeners {
key := IngressListenerKeyFromListener(l)
snap.IngressGateway.Listeners[key] = l
}
if err := s.watchIngressLeafCert(ctx, snap); err != nil {
return err
}
case u.CorrelationID == gatewayServicesWatchID:
services, ok := u.Result.(*structs.IndexedGatewayServices)
if !ok {
return fmt.Errorf("invalid type for response: %T", u.Result)
}
// Update our upstreams and watches.
var hosts []string
watchedSvcs := make(map[string]struct{})
upstreamsMap := make(map[IngressListenerKey]structs.Upstreams)
for _, service := range services.Services {
u := makeUpstream(service)
watchOpts := discoveryChainWatchOpts{
id: u.Identifier(),
name: u.DestinationName,
namespace: u.DestinationNamespace,
partition: u.DestinationPartition,
datacenter: s.source.Datacenter,
}
up := &handlerUpstreams{handlerState: s.handlerState}
err := up.watchDiscoveryChain(ctx, snap, watchOpts)
if err != nil {
return fmt.Errorf("failed to watch discovery chain for %s: %v", u.Identifier(), err)
}
watchedSvcs[u.Identifier()] = struct{}{}
hosts = append(hosts, service.Hosts...)
id := IngressListenerKeyFromGWService(*service)
upstreamsMap[id] = append(upstreamsMap[id], u)
}
snap.IngressGateway.Upstreams = upstreamsMap
snap.IngressGateway.Hosts = hosts
snap.IngressGateway.HostsSet = true
for id, cancelFn := range snap.IngressGateway.WatchedDiscoveryChains {
if _, ok := watchedSvcs[id]; !ok {
cancelFn()
delete(snap.IngressGateway.WatchedDiscoveryChains, id)
}
}
if err := s.watchIngressLeafCert(ctx, snap); err != nil {
return err
}
default:
return (*handlerUpstreams)(s).handleUpdateUpstreams(ctx, u, snap)
}
return nil
}
// Note: Ingress gateways are always bound to ports and never unix sockets.
// This means LocalBindPort is the only possibility
func makeUpstream(g *structs.GatewayService) structs.Upstream {
upstream := structs.Upstream{
DestinationName: g.Service.Name,
DestinationNamespace: g.Service.NamespaceOrDefault(),
DestinationPartition: g.Service.PartitionOrDefault(),
LocalBindPort: g.Port,
IngressHosts: g.Hosts,
// Pass the protocol that was configured on the ingress listener in order
// to force that protocol on the Envoy listener.
Config: map[string]interface{}{
"protocol": g.Protocol,
},
}
return upstream
}
func (s *handlerIngressGateway) watchIngressLeafCert(ctx context.Context, snap *ConfigSnapshot) error {
// Note that we DON'T test for TLS.Enabled because we need a leaf cert for the
// gateway even without TLS to use as a client cert.
if !snap.IngressGateway.GatewayConfigLoaded || !snap.IngressGateway.HostsSet {
return nil
}
// Watch the leaf cert
if snap.IngressGateway.LeafCertWatchCancel != nil {
snap.IngressGateway.LeafCertWatchCancel()
}
ctx, cancel := context.WithCancel(ctx)
err := s.cache.Notify(ctx, cachetype.ConnectCALeafName, &cachetype.ConnectCALeafRequest{
Datacenter: s.source.Datacenter,
Token: s.token,
Service: s.service,
DNSSAN: s.generateIngressDNSSANs(snap),
EnterpriseMeta: s.proxyID.EnterpriseMeta,
}, leafWatchID, s.ch)
if err != nil {
cancel()
return err
}
snap.IngressGateway.LeafCertWatchCancel = cancel
return nil
}
// connectTLSServingEnabled returns true if Connect TLS is enabled at either
// gateway level or for at least one of the specific listeners.
func connectTLSServingEnabled(snap *ConfigSnapshot) bool {
if snap.IngressGateway.TLSConfig.Enabled {
return true
}
for _, l := range snap.IngressGateway.Listeners {
if l.TLS != nil && l.TLS.Enabled {
return true
}
}
return false
}
func (s *handlerIngressGateway) generateIngressDNSSANs(snap *ConfigSnapshot) []string {
// Update our leaf cert watch with wildcard entries for our DNS domains as
// well as any configured custom hostnames from the service. Note that in the
// case that only a subset of listeners are TLS-enabled, we still load DNS
// SANs for all upstreams. We could limit it to only those that are reachable
// from the enabled listeners but that adds a lot of complication and they are
// already wildcards anyway. It's simpler to have one certificate for the
// whole proxy that works for any possible upstream we might need than try to
// be more selective when we are already using wildcard DNS names!
if !connectTLSServingEnabled(snap) {
return nil
}
var dnsNames []string
namespaces := make(map[string]struct{})
for _, upstreams := range snap.IngressGateway.Upstreams {
for _, u := range upstreams {
namespaces[u.DestinationNamespace] = struct{}{}
}
}
// TODO(partitions): How should these be updated for partitions?
for ns := range namespaces {
// The default namespace is special cased in DNS resolution, so special
// case it here.
if ns == structs.IntentionDefaultNamespace {
ns = ""
} else {
ns = ns + "."
}
dnsNames = append(dnsNames, fmt.Sprintf("*.ingress.%s%s", ns, s.dnsConfig.Domain))
dnsNames = append(dnsNames, fmt.Sprintf("*.ingress.%s%s.%s", ns, s.source.Datacenter, s.dnsConfig.Domain))
if s.dnsConfig.AltDomain != "" {
dnsNames = append(dnsNames, fmt.Sprintf("*.ingress.%s%s", ns, s.dnsConfig.AltDomain))
dnsNames = append(dnsNames, fmt.Sprintf("*.ingress.%s%s.%s", ns, s.source.Datacenter, s.dnsConfig.AltDomain))
}
}
dnsNames = append(dnsNames, snap.IngressGateway.Hosts...)
return dnsNames
}