traefik/pkg/provider/kubernetes/gateway/tlsroute.go

301 lines
9.9 KiB
Go
Raw Normal View History

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