mirror of https://github.com/hashicorp/consul
600 lines
19 KiB
Go
600 lines
19 KiB
Go
package structs
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import (
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"fmt"
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"sort"
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"strings"
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"github.com/miekg/dns"
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"github.com/hashicorp/consul/acl"
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"github.com/hashicorp/consul/lib/stringslice"
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)
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// IngressGatewayConfigEntry manages the configuration for an ingress service
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// with the given name.
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type IngressGatewayConfigEntry struct {
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// Kind of the config entry. This will be set to structs.IngressGateway.
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Kind string
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// Name is used to match the config entry with its associated ingress gateway
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// service. This should match the name provided in the service definition.
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Name string
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// TLS holds the TLS configuration for this gateway. It would be nicer if it
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// were a pointer so it could be omitempty when read back in JSON but that
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// would be a breaking API change now as we currently always return it.
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TLS GatewayTLSConfig
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// Listeners declares what ports the ingress gateway should listen on, and
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// what services to associated to those ports.
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Listeners []IngressListener
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Meta map[string]string `json:",omitempty"`
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EnterpriseMeta `hcl:",squash" mapstructure:",squash"`
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RaftIndex
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}
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type IngressListener struct {
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// Port declares the port on which the ingress gateway should listen for traffic.
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Port int
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// Protocol declares what type of traffic this listener is expected to
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// receive. Depending on the protocol, a listener might support multiplexing
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// services over a single port, or additional discovery chain features. The
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// current supported values are: (tcp | http | http2 | grpc).
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Protocol string
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// TLS config for this listener.
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TLS *GatewayTLSConfig `json:",omitempty"`
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// Services declares the set of services to which the listener forwards
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// traffic.
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//
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// For "tcp" protocol listeners, only a single service is allowed.
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// For "http" listeners, multiple services can be declared.
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Services []IngressService
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}
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type IngressService struct {
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// Name declares the service to which traffic should be forwarded.
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//
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// This can either be a specific service, or the wildcard specifier,
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// "*". If the wildcard specifier is provided, the listener must be of "http"
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// protocol and means that the listener will forward traffic to all services.
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//
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// A name can be specified on multiple listeners, and will be exposed on both
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// of the listeners
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Name string
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// Hosts is a list of hostnames which should be associated to this service on
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// the defined listener. Only allowed on layer 7 protocols, this will be used
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// to route traffic to the service by matching the Host header of the HTTP
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// request.
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//
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// If a host is provided for a service that also has a wildcard specifier
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// defined, the host will override the wildcard-specifier-provided
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// "<service-name>.*" domain for that listener.
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//
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// This cannot be specified when using the wildcard specifier, "*", or when
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// using a "tcp" listener.
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Hosts []string
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// TLS configuration overrides for this service. At least one entry must exist
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// in Hosts to use set and the Listener must also have a default Cert loaded
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// from SDS.
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TLS *GatewayServiceTLSConfig
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// Allow HTTP header manipulation to be configured.
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RequestHeaders *HTTPHeaderModifiers `json:",omitempty" alias:"request_headers"`
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ResponseHeaders *HTTPHeaderModifiers `json:",omitempty" alias:"response_headers"`
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Meta map[string]string `json:",omitempty"`
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EnterpriseMeta `hcl:",squash" mapstructure:",squash"`
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}
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type GatewayTLSConfig struct {
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// Indicates that TLS should be enabled for this gateway or listener
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Enabled bool
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// SDS allows configuring TLS certificate from an SDS service.
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SDS *GatewayTLSSDSConfig `json:",omitempty"`
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}
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type GatewayServiceTLSConfig struct {
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// Note no Enabled field here since it doesn't make sense to disable TLS on
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// one host on a TLS-configured listener.
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// SDS allows configuring TLS certificate from an SDS service.
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SDS *GatewayTLSSDSConfig `json:",omitempty"`
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}
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type GatewayTLSSDSConfig struct {
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ClusterName string `json:",omitempty" alias:"cluster_name"`
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CertResource string `json:",omitempty" alias:"cert_resource"`
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}
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func (e *IngressGatewayConfigEntry) GetKind() string {
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return IngressGateway
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}
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func (e *IngressGatewayConfigEntry) GetName() string {
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if e == nil {
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return ""
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}
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return e.Name
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}
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func (e *IngressGatewayConfigEntry) GetMeta() map[string]string {
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if e == nil {
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return nil
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}
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return e.Meta
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}
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func (e *IngressGatewayConfigEntry) Normalize() error {
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if e == nil {
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return fmt.Errorf("config entry is nil")
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}
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e.Kind = IngressGateway
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e.EnterpriseMeta.Normalize()
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for i, listener := range e.Listeners {
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if listener.Protocol == "" {
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listener.Protocol = "tcp"
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}
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listener.Protocol = strings.ToLower(listener.Protocol)
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for i := range listener.Services {
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listener.Services[i].EnterpriseMeta.Merge(&e.EnterpriseMeta)
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listener.Services[i].EnterpriseMeta.Normalize()
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}
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// Make sure to set the item back into the array, since we are not using
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// pointers to structs
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e.Listeners[i] = listener
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}
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return nil
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}
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func (e *IngressGatewayConfigEntry) Validate() error {
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if err := validateConfigEntryMeta(e.Meta); err != nil {
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return err
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}
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validProtocols := map[string]bool{
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"tcp": true,
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"http": true,
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"http2": true,
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"grpc": true,
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}
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declaredPorts := make(map[int]bool)
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// Validate SDS TLS configs make sense
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gwSDSClusterSet := false
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gwSDSCertSet := false
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if e.TLS.SDS != nil {
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// Gateway level SDS config must set ClusterName if it specifies a default
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// certificate. Just a clustername is OK though if certs are specified
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// per-listener.
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if e.TLS.SDS.ClusterName == "" && e.TLS.SDS.CertResource != "" {
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return fmt.Errorf("TLS.SDS.ClusterName is required if CertResource is set")
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}
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// Note we rely on the fact that ClusterName must be non-empty if any SDS
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// properties are defined (validated above) at this level in validation
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// below that uses this variable. If that changes we will need to change the
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// code below too.
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gwSDSClusterSet = (e.TLS.SDS.ClusterName != "")
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gwSDSCertSet = (e.TLS.SDS.CertResource != "")
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}
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for _, listener := range e.Listeners {
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if _, ok := declaredPorts[listener.Port]; ok {
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return fmt.Errorf("port %d declared on two listeners", listener.Port)
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}
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declaredPorts[listener.Port] = true
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if _, ok := validProtocols[listener.Protocol]; !ok {
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return fmt.Errorf("protocol must be 'tcp', 'http', 'http2', or 'grpc'. '%s' is an unsupported protocol", listener.Protocol)
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}
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if len(listener.Services) == 0 {
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return fmt.Errorf("No service declared for listener with port %d", listener.Port)
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}
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// Validate that http features aren't being used with tcp or another non-supported protocol.
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if listener.Protocol != "http" && len(listener.Services) > 1 {
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return fmt.Errorf("Multiple services per listener are only supported for protocol = 'http' (listener on port %d)",
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listener.Port)
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}
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// Validate listener-level SDS config.
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lisSDSCertSet := false
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lisSDSClusterSet := false
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if listener.TLS != nil && listener.TLS.SDS != nil {
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lisSDSCertSet = (listener.TLS.SDS.CertResource != "")
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lisSDSClusterSet = (listener.TLS.SDS.ClusterName != "")
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}
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// If SDS was setup at gw level but without a default CertResource, the
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// listener MUST set a CertResource.
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if gwSDSClusterSet && !gwSDSCertSet && !lisSDSCertSet {
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return fmt.Errorf("TLS.SDS.CertResource is required if ClusterName is set for gateway (listener on port %d)", listener.Port)
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}
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// If listener set a cluster name then it requires a cert resource too.
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if lisSDSClusterSet && !lisSDSCertSet {
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return fmt.Errorf("TLS.SDS.CertResource is required if ClusterName is set for listener (listener on port %d)", listener.Port)
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}
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// If a listener-level cert is given, we need a cluster from at least one
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// level.
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if lisSDSCertSet && !lisSDSClusterSet && !gwSDSClusterSet {
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return fmt.Errorf("TLS.SDS.ClusterName is required if CertResource is set (listener on port %d)", listener.Port)
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}
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declaredHosts := make(map[string]bool)
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serviceNames := make(map[ServiceID]struct{})
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for i, s := range listener.Services {
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if err := validateInnerEnterpriseMeta(&s.EnterpriseMeta, &e.EnterpriseMeta); err != nil {
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return fmt.Errorf("services[%d]: %w", i, err)
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}
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sn := NewServiceName(s.Name, &s.EnterpriseMeta)
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if err := s.RequestHeaders.Validate(listener.Protocol); err != nil {
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return fmt.Errorf("request headers %s (service %q on listener on port %d)", err, sn.String(), listener.Port)
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}
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if err := s.ResponseHeaders.Validate(listener.Protocol); err != nil {
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return fmt.Errorf("response headers %s (service %q on listener on port %d)", err, sn.String(), listener.Port)
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}
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if listener.Protocol == "tcp" {
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if s.Name == WildcardSpecifier {
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return fmt.Errorf("Wildcard service name is only valid for protocol = 'http' (listener on port %d)", listener.Port)
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}
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if len(s.Hosts) != 0 {
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return fmt.Errorf("Associating hosts to a service is not supported for the %s protocol (listener on port %d)", listener.Protocol, listener.Port)
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}
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}
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if s.Name == "" {
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return fmt.Errorf("Service name cannot be blank (listener on port %d)", listener.Port)
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}
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if s.Name == WildcardSpecifier && len(s.Hosts) != 0 {
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return fmt.Errorf("Associating hosts to a wildcard service is not supported (listener on port %d)", listener.Port)
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}
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if s.NamespaceOrDefault() == WildcardSpecifier {
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return fmt.Errorf("Wildcard namespace is not supported for ingress services (listener on port %d)", listener.Port)
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}
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sid := NewServiceID(s.Name, &s.EnterpriseMeta)
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if _, ok := serviceNames[sid]; ok {
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return fmt.Errorf("Service %s cannot be added multiple times (listener on port %d)", sid, listener.Port)
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}
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serviceNames[sid] = struct{}{}
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svcSDSSet := (s.TLS != nil && s.TLS.SDS != nil && s.TLS.SDS.CertResource != "")
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if svcSDSSet && len(s.Hosts) < 1 {
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return fmt.Errorf("A service specifying TLS.SDS.CertResource must have at least one item in Hosts (service %q on listener on port %d)",
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sid.String(), listener.Port)
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}
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if svcSDSSet && s.TLS.SDS.ClusterName == "" && !lisSDSClusterSet && !gwSDSClusterSet {
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return fmt.Errorf("TLS.SDS.ClusterName is required if CertResource is set (service %q on listener on port %d)",
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sid.String(), listener.Port)
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}
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for _, h := range s.Hosts {
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if declaredHosts[h] {
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return fmt.Errorf("Hosts must be unique within a specific listener (listener on port %d)", listener.Port)
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}
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declaredHosts[h] = true
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if err := validateHost(e.TLS.Enabled, h); err != nil {
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return err
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}
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}
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}
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}
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return nil
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}
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func validateHost(tlsEnabled bool, host string) error {
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// Special case '*' so that non-TLS ingress gateways can use it. This allows
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// an easy demo/testing experience.
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if host == "*" {
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if tlsEnabled {
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return fmt.Errorf("Host '*' is not allowed when TLS is enabled, all hosts must be valid DNS records to add as a DNSSAN")
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}
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return nil
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}
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wildcardPrefix := "*."
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if _, ok := dns.IsDomainName(host); !ok {
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return fmt.Errorf("Host %q must be a valid DNS hostname", host)
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}
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if strings.ContainsRune(strings.TrimPrefix(host, wildcardPrefix), '*') {
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return fmt.Errorf("Host %q is not valid, a wildcard specifier is only allowed as the leftmost label", host)
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}
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return nil
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}
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// ListRelatedServices implements discoveryChainConfigEntry
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//
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// For ingress-gateway config entries this only finds services that are
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// explicitly linked in the ingress-gateway config entry. Wildcards will not
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// expand to all services.
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//
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// This function is used during discovery chain graph validation to prevent
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// erroneous sets of config entries from being created. Wildcard ingress
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// filters out sets with protocol mismatch elsewhere so it isn't an issue here
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// that needs fixing.
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func (e *IngressGatewayConfigEntry) ListRelatedServices() []ServiceID {
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found := make(map[ServiceID]struct{})
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for _, listener := range e.Listeners {
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for _, service := range listener.Services {
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if service.Name == WildcardSpecifier {
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continue
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}
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svcID := NewServiceID(service.Name, &service.EnterpriseMeta)
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found[svcID] = struct{}{}
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}
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}
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if len(found) == 0 {
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return nil
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}
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out := make([]ServiceID, 0, len(found))
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for svc := range found {
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out = append(out, svc)
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}
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sort.Slice(out, func(i, j int) bool {
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return out[i].EnterpriseMeta.LessThan(&out[j].EnterpriseMeta) ||
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out[i].ID < out[j].ID
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})
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return out
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}
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func (e *IngressGatewayConfigEntry) CanRead(authz acl.Authorizer) bool {
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var authzContext acl.AuthorizerContext
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e.FillAuthzContext(&authzContext)
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return authz.ServiceRead(e.Name, &authzContext) == acl.Allow
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}
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func (e *IngressGatewayConfigEntry) CanWrite(authz acl.Authorizer) bool {
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var authzContext acl.AuthorizerContext
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e.FillAuthzContext(&authzContext)
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return authz.MeshWrite(&authzContext) == acl.Allow
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}
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func (e *IngressGatewayConfigEntry) GetRaftIndex() *RaftIndex {
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if e == nil {
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return &RaftIndex{}
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}
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return &e.RaftIndex
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}
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func (e *IngressGatewayConfigEntry) GetEnterpriseMeta() *EnterpriseMeta {
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if e == nil {
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return nil
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}
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return &e.EnterpriseMeta
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}
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func (s *IngressService) ToServiceName() ServiceName {
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return NewServiceName(s.Name, &s.EnterpriseMeta)
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}
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// TerminatingGatewayConfigEntry manages the configuration for a terminating service
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// with the given name.
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type TerminatingGatewayConfigEntry struct {
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Kind string
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Name string
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Services []LinkedService
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Meta map[string]string `json:",omitempty"`
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EnterpriseMeta `hcl:",squash" mapstructure:",squash"`
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RaftIndex
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}
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// A LinkedService is a service represented by a terminating gateway
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type LinkedService struct {
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// Name is the name of the service, as defined in Consul's catalog
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Name string `json:",omitempty"`
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// CAFile is the optional path to a CA certificate to use for TLS connections
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// from the gateway to the linked service
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CAFile string `json:",omitempty" alias:"ca_file"`
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// CertFile is the optional path to a client certificate to use for TLS connections
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// from the gateway to the linked service
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CertFile string `json:",omitempty" alias:"cert_file"`
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// KeyFile is the optional path to a private key to use for TLS connections
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// from the gateway to the linked service
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KeyFile string `json:",omitempty" alias:"key_file"`
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// SNI is the optional name to specify during the TLS handshake with a linked service
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SNI string `json:",omitempty"`
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EnterpriseMeta `hcl:",squash" mapstructure:",squash"`
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}
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func (e *TerminatingGatewayConfigEntry) GetKind() string {
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return TerminatingGateway
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}
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func (e *TerminatingGatewayConfigEntry) GetName() string {
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if e == nil {
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return ""
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}
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return e.Name
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}
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func (e *TerminatingGatewayConfigEntry) GetMeta() map[string]string {
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if e == nil {
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return nil
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}
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return e.Meta
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}
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func (e *TerminatingGatewayConfigEntry) Normalize() error {
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if e == nil {
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return fmt.Errorf("config entry is nil")
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}
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e.Kind = TerminatingGateway
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e.EnterpriseMeta.Normalize()
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for i := range e.Services {
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e.Services[i].EnterpriseMeta.Merge(&e.EnterpriseMeta)
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e.Services[i].EnterpriseMeta.Normalize()
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}
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return nil
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}
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func (e *TerminatingGatewayConfigEntry) Validate() error {
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if err := validateConfigEntryMeta(e.Meta); err != nil {
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return err
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}
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seen := make(map[ServiceID]bool)
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for _, svc := range e.Services {
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if svc.Name == "" {
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return fmt.Errorf("Service name cannot be blank.")
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}
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ns := svc.NamespaceOrDefault()
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if ns == WildcardSpecifier {
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return fmt.Errorf("Wildcard namespace is not supported for terminating gateway services")
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}
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cid := NewServiceID(svc.Name, &svc.EnterpriseMeta)
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if err := validateInnerEnterpriseMeta(&svc.EnterpriseMeta, &e.EnterpriseMeta); err != nil {
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return fmt.Errorf("service %q: %w", cid, err)
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}
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// Check for duplicates within the entry
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if ok := seen[cid]; ok {
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return fmt.Errorf("Service %q was specified more than once within a namespace", cid.String())
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}
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seen[cid] = true
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// If either client cert config file was specified then the CA file, client cert, and key file must be specified
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// Specifying only a CAFile is allowed for one-way TLS
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if (svc.CertFile != "" || svc.KeyFile != "") &&
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!(svc.CAFile != "" && svc.CertFile != "" && svc.KeyFile != "") {
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return fmt.Errorf("Service %q must have a CertFile, CAFile, and KeyFile specified for TLS origination", svc.Name)
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}
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}
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return nil
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}
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func (e *TerminatingGatewayConfigEntry) CanRead(authz acl.Authorizer) bool {
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var authzContext acl.AuthorizerContext
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e.FillAuthzContext(&authzContext)
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return authz.ServiceRead(e.Name, &authzContext) == acl.Allow
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}
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func (e *TerminatingGatewayConfigEntry) CanWrite(authz acl.Authorizer) bool {
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var authzContext acl.AuthorizerContext
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e.FillAuthzContext(&authzContext)
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return authz.MeshWrite(&authzContext) == acl.Allow
|
|
}
|
|
|
|
func (e *TerminatingGatewayConfigEntry) GetRaftIndex() *RaftIndex {
|
|
if e == nil {
|
|
return &RaftIndex{}
|
|
}
|
|
|
|
return &e.RaftIndex
|
|
}
|
|
|
|
func (e *TerminatingGatewayConfigEntry) GetEnterpriseMeta() *EnterpriseMeta {
|
|
if e == nil {
|
|
return nil
|
|
}
|
|
|
|
return &e.EnterpriseMeta
|
|
}
|
|
|
|
// GatewayService is used to associate gateways with their linked services.
|
|
type GatewayService struct {
|
|
Gateway ServiceName
|
|
Service ServiceName
|
|
GatewayKind ServiceKind
|
|
Port int `json:",omitempty"`
|
|
Protocol string `json:",omitempty"`
|
|
Hosts []string `json:",omitempty"`
|
|
CAFile string `json:",omitempty"`
|
|
CertFile string `json:",omitempty"`
|
|
KeyFile string `json:",omitempty"`
|
|
SNI string `json:",omitempty"`
|
|
FromWildcard bool `json:",omitempty"`
|
|
RaftIndex
|
|
}
|
|
|
|
type GatewayServices []*GatewayService
|
|
|
|
func (g *GatewayService) Addresses(defaultHosts []string) []string {
|
|
if g.Port == 0 {
|
|
return nil
|
|
}
|
|
|
|
hosts := g.Hosts
|
|
if len(hosts) == 0 {
|
|
hosts = defaultHosts
|
|
}
|
|
|
|
var addresses []string
|
|
// loop through the hosts and format that into domain.name:port format,
|
|
// ensuring we trim any trailing DNS . characters from the domain name as we
|
|
// go
|
|
for _, h := range hosts {
|
|
addresses = append(addresses, fmt.Sprintf("%s:%d", strings.TrimRight(h, "."), g.Port))
|
|
}
|
|
return addresses
|
|
}
|
|
|
|
func (g *GatewayService) IsSame(o *GatewayService) bool {
|
|
return g.Gateway.Matches(o.Gateway) &&
|
|
g.Service.Matches(o.Service) &&
|
|
g.GatewayKind == o.GatewayKind &&
|
|
g.Port == o.Port &&
|
|
g.Protocol == o.Protocol &&
|
|
stringslice.Equal(g.Hosts, o.Hosts) &&
|
|
g.CAFile == o.CAFile &&
|
|
g.CertFile == o.CertFile &&
|
|
g.KeyFile == o.KeyFile &&
|
|
g.SNI == o.SNI &&
|
|
g.FromWildcard == o.FromWildcard
|
|
}
|
|
|
|
func (g *GatewayService) Clone() *GatewayService {
|
|
return &GatewayService{
|
|
Gateway: g.Gateway,
|
|
Service: g.Service,
|
|
GatewayKind: g.GatewayKind,
|
|
Port: g.Port,
|
|
Protocol: g.Protocol,
|
|
// See https://github.com/go101/go101/wiki/How-to-efficiently-clone-a-slice%3F
|
|
Hosts: append(g.Hosts[:0:0], g.Hosts...),
|
|
CAFile: g.CAFile,
|
|
CertFile: g.CertFile,
|
|
KeyFile: g.KeyFile,
|
|
SNI: g.SNI,
|
|
FromWildcard: g.FromWildcard,
|
|
RaftIndex: g.RaftIndex,
|
|
}
|
|
}
|