332 lines
11 KiB
Go
332 lines
11 KiB
Go
package gateway
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import (
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"context"
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"fmt"
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"net"
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"regexp"
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"strconv"
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"strings"
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"github.com/rs/zerolog/log"
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"github.com/traefik/traefik/v3/pkg/config/dynamic"
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"github.com/traefik/traefik/v3/pkg/provider"
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corev1 "k8s.io/api/core/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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ktypes "k8s.io/apimachinery/pkg/types"
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"k8s.io/utils/ptr"
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gatev1 "sigs.k8s.io/gateway-api/apis/v1"
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gatev1alpha2 "sigs.k8s.io/gateway-api/apis/v1alpha2"
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)
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func (p *Provider) loadTLSRoutes(ctx context.Context, gatewayListeners []gatewayListener, conf *dynamic.Configuration) {
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logger := log.Ctx(ctx)
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routes, err := p.client.ListTLSRoutes()
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if err != nil {
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logger.Error().Err(err).Msgf("Unable to list TLSRoute")
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return
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}
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for _, route := range routes {
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logger := log.Ctx(ctx).With().
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Str("tls_route", route.Name).
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Str("namespace", route.Namespace).Logger()
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routeListeners := matchingGatewayListeners(gatewayListeners, route.Namespace, route.Spec.ParentRefs)
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if len(routeListeners) == 0 {
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continue
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}
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var parentStatuses []gatev1alpha2.RouteParentStatus
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for _, parentRef := range route.Spec.ParentRefs {
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parentStatus := &gatev1alpha2.RouteParentStatus{
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ParentRef: parentRef,
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ControllerName: controllerName,
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Conditions: []metav1.Condition{
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{
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Type: string(gatev1.RouteConditionAccepted),
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Status: metav1.ConditionFalse,
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ObservedGeneration: route.Generation,
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LastTransitionTime: metav1.Now(),
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Reason: string(gatev1.RouteReasonNoMatchingParent),
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},
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},
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}
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for _, listener := range routeListeners {
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accepted := matchListener(listener, parentRef)
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if accepted && !allowRoute(listener, route.Namespace, kindTLSRoute) {
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parentStatus.Conditions = updateRouteConditionAccepted(parentStatus.Conditions, string(gatev1.RouteReasonNotAllowedByListeners))
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accepted = false
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}
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hostnames, ok := findMatchingHostnames(listener.Hostname, route.Spec.Hostnames)
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if accepted && !ok {
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parentStatus.Conditions = updateRouteConditionAccepted(parentStatus.Conditions, string(gatev1.RouteReasonNoMatchingListenerHostname))
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accepted = false
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}
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if accepted {
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listener.Status.AttachedRoutes++
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// only consider the route attached if the listener is in an "attached" state.
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if listener.Attached {
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parentStatus.Conditions = updateRouteConditionAccepted(parentStatus.Conditions, string(gatev1.RouteReasonAccepted))
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}
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}
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routeConf, resolveRefCondition := p.loadTLSRoute(listener, route, hostnames)
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if accepted && listener.Attached {
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mergeTCPConfiguration(routeConf, conf)
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}
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parentStatus.Conditions = upsertRouteConditionResolvedRefs(parentStatus.Conditions, resolveRefCondition)
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}
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parentStatuses = append(parentStatuses, *parentStatus)
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}
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routeStatus := gatev1alpha2.TLSRouteStatus{
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RouteStatus: gatev1alpha2.RouteStatus{
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Parents: parentStatuses,
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},
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}
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if err := p.client.UpdateTLSRouteStatus(ctx, ktypes.NamespacedName{Namespace: route.Namespace, Name: route.Name}, routeStatus); err != nil {
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logger.Warn().
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Err(err).
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Msg("Unable to update TLSRoute status")
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}
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}
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}
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func (p *Provider) loadTLSRoute(listener gatewayListener, route *gatev1alpha2.TLSRoute, hostnames []gatev1.Hostname) (*dynamic.Configuration, metav1.Condition) {
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conf := &dynamic.Configuration{
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TCP: &dynamic.TCPConfiguration{
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Routers: make(map[string]*dynamic.TCPRouter),
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Middlewares: make(map[string]*dynamic.TCPMiddleware),
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Services: make(map[string]*dynamic.TCPService),
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ServersTransports: make(map[string]*dynamic.TCPServersTransport),
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},
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}
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condition := metav1.Condition{
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Type: string(gatev1.RouteConditionResolvedRefs),
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Status: metav1.ConditionTrue,
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ObservedGeneration: route.Generation,
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LastTransitionTime: metav1.Now(),
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Reason: string(gatev1.RouteConditionResolvedRefs),
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}
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for ri, routeRule := range route.Spec.Rules {
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if len(routeRule.BackendRefs) == 0 {
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// Should not happen due to validation.
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// https://github.com/kubernetes-sigs/gateway-api/blob/v0.4.0/apis/v1alpha2/tlsroute_types.go#L120
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continue
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}
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router := dynamic.TCPRouter{
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RuleSyntax: "v3",
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Rule: hostSNIRule(hostnames),
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EntryPoints: []string{listener.EPName},
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TLS: &dynamic.RouterTCPTLSConfig{
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Passthrough: listener.TLS != nil && listener.TLS.Mode != nil && *listener.TLS.Mode == gatev1.TLSModePassthrough,
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},
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}
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// Adding the gateway desc and the entryPoint desc prevents overlapping of routers build from the same routes.
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routeKey := provider.Normalize(fmt.Sprintf("%s-%s-%s-gw-%s-%s-ep-%s-%d", strings.ToLower(kindTLSRoute), route.Namespace, route.Name, listener.GWNamespace, listener.GWName, listener.EPName, ri))
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// Routing criteria should be introduced at some point.
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routerName := makeRouterName("", routeKey)
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if len(routeRule.BackendRefs) == 1 && isInternalService(routeRule.BackendRefs[0]) {
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router.Service = string(routeRule.BackendRefs[0].Name)
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conf.TCP.Routers[routerName] = &router
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continue
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}
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var serviceCondition *metav1.Condition
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router.Service, serviceCondition = p.loadTLSWRRService(conf, routerName, routeRule.BackendRefs, route)
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if serviceCondition != nil {
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condition = *serviceCondition
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}
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conf.TCP.Routers[routerName] = &router
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}
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return conf, condition
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}
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// loadTLSWRRService is generating a WRR service, even when there is only one target.
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func (p *Provider) loadTLSWRRService(conf *dynamic.Configuration, routeKey string, backendRefs []gatev1.BackendRef, route *gatev1alpha2.TLSRoute) (string, *metav1.Condition) {
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name := routeKey + "-wrr"
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if _, ok := conf.TCP.Services[name]; ok {
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return name, nil
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}
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var wrr dynamic.TCPWeightedRoundRobin
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var condition *metav1.Condition
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for _, backendRef := range backendRefs {
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svcName, svc, errCondition := p.loadTLSService(route, backendRef)
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weight := ptr.To(int(ptr.Deref(backendRef.Weight, 1)))
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if errCondition != nil {
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condition = errCondition
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errName := routeKey + "-err-lb"
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conf.TCP.Services[errName] = &dynamic.TCPService{
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LoadBalancer: &dynamic.TCPServersLoadBalancer{
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Servers: []dynamic.TCPServer{},
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},
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}
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wrr.Services = append(wrr.Services, dynamic.TCPWRRService{
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Name: errName,
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Weight: weight,
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})
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continue
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}
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if svc != nil {
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conf.TCP.Services[svcName] = svc
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}
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wrr.Services = append(wrr.Services, dynamic.TCPWRRService{
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Name: svcName,
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Weight: weight,
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})
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}
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conf.TCP.Services[name] = &dynamic.TCPService{Weighted: &wrr}
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return name, condition
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}
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func (p *Provider) loadTLSService(route *gatev1alpha2.TLSRoute, backendRef gatev1.BackendRef) (string, *dynamic.TCPService, *metav1.Condition) {
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kind := ptr.Deref(backendRef.Kind, kindService)
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group := groupCore
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if backendRef.Group != nil && *backendRef.Group != "" {
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group = string(*backendRef.Group)
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}
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namespace := route.Namespace
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if backendRef.Namespace != nil && *backendRef.Namespace != "" {
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namespace = string(*backendRef.Namespace)
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}
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serviceName := provider.Normalize(namespace + "-" + string(backendRef.Name))
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if err := p.isReferenceGranted(kindTLSRoute, route.Namespace, group, string(kind), string(backendRef.Name), namespace); err != nil {
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return serviceName, nil, &metav1.Condition{
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Type: string(gatev1.RouteConditionResolvedRefs),
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Status: metav1.ConditionFalse,
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ObservedGeneration: route.Generation,
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LastTransitionTime: metav1.Now(),
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Reason: string(gatev1.RouteReasonRefNotPermitted),
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Message: fmt.Sprintf("Cannot load TLSRoute BackendRef %s/%s/%s/%s: %s", group, kind, namespace, backendRef.Name, err),
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}
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}
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if group != groupCore || kind != kindService {
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name, err := p.loadTCPBackendRef(backendRef)
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if err != nil {
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return serviceName, nil, &metav1.Condition{
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Type: string(gatev1.RouteConditionResolvedRefs),
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Status: metav1.ConditionFalse,
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ObservedGeneration: route.Generation,
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LastTransitionTime: metav1.Now(),
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Reason: string(gatev1.RouteReasonInvalidKind),
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Message: fmt.Sprintf("Cannot load TLSRoute BackendRef %s/%s/%s/%s: %s", group, kind, namespace, backendRef.Name, err),
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}
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}
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return name, nil, nil
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}
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port := ptr.Deref(backendRef.Port, gatev1.PortNumber(0))
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if port == 0 {
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return serviceName, nil, &metav1.Condition{
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Type: string(gatev1.RouteConditionResolvedRefs),
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Status: metav1.ConditionFalse,
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ObservedGeneration: route.Generation,
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LastTransitionTime: metav1.Now(),
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Reason: string(gatev1.RouteReasonUnsupportedProtocol),
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Message: fmt.Sprintf("Cannot load TLSRoute BackendRef %s/%s/%s/%s port is required", group, kind, namespace, backendRef.Name),
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}
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}
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portStr := strconv.FormatInt(int64(port), 10)
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serviceName = provider.Normalize(serviceName + "-" + portStr)
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lb, errCondition := p.loadTLSServers(namespace, route, backendRef)
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if errCondition != nil {
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return serviceName, nil, errCondition
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}
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return serviceName, &dynamic.TCPService{LoadBalancer: lb}, nil
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}
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func (p *Provider) loadTLSServers(namespace string, route *gatev1alpha2.TLSRoute, backendRef gatev1.BackendRef) (*dynamic.TCPServersLoadBalancer, *metav1.Condition) {
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backendAddresses, svcPort, err := p.getBackendAddresses(namespace, backendRef)
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if err != nil {
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return nil, &metav1.Condition{
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Type: string(gatev1.RouteConditionResolvedRefs),
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Status: metav1.ConditionFalse,
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ObservedGeneration: route.GetGeneration(),
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LastTransitionTime: metav1.Now(),
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Reason: string(gatev1.RouteReasonBackendNotFound),
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Message: fmt.Sprintf("Cannot load TLSRoute BackendRef %s/%s: %s", namespace, backendRef.Name, err),
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}
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}
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if svcPort.Protocol != corev1.ProtocolTCP {
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return nil, &metav1.Condition{
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Type: string(gatev1.RouteConditionResolvedRefs),
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Status: metav1.ConditionFalse,
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ObservedGeneration: route.GetGeneration(),
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LastTransitionTime: metav1.Now(),
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Reason: string(gatev1.RouteReasonUnsupportedProtocol),
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Message: fmt.Sprintf("Cannot load TLSRoute BackendRef %s/%s: only TCP protocol is supported", namespace, backendRef.Name),
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}
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}
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lb := &dynamic.TCPServersLoadBalancer{}
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for _, ba := range backendAddresses {
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lb.Servers = append(lb.Servers, dynamic.TCPServer{
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// TODO determine whether the servers needs TLS, from the port?
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Address: net.JoinHostPort(ba.IP, strconv.Itoa(int(ba.Port))),
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})
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}
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return lb, nil
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}
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func hostSNIRule(hostnames []gatev1.Hostname) string {
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rules := make([]string, 0, len(hostnames))
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uniqHostnames := map[gatev1.Hostname]struct{}{}
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for _, hostname := range hostnames {
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if len(hostname) == 0 {
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continue
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}
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if _, exists := uniqHostnames[hostname]; exists {
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continue
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}
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host := string(hostname)
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uniqHostnames[hostname] = struct{}{}
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wildcard := strings.Count(host, "*")
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if wildcard == 0 {
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rules = append(rules, fmt.Sprintf("HostSNI(`%s`)", host))
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continue
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}
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host = strings.Replace(regexp.QuoteMeta(host), `\*\.`, `[a-z0-9-\.]+\.`, 1)
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rules = append(rules, fmt.Sprintf("HostSNIRegexp(`^%s$`)", host))
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}
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if len(hostnames) == 0 || len(rules) == 0 {
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return "HostSNI(`*`)"
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}
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return strings.Join(rules, " || ")
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}
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