package xds import ( "encoding/json" "errors" "fmt" "net" "net/url" "regexp" "strconv" "strings" envoy "github.com/envoyproxy/go-control-plane/envoy/api/v2" envoyauth "github.com/envoyproxy/go-control-plane/envoy/api/v2/auth" envoycore "github.com/envoyproxy/go-control-plane/envoy/api/v2/core" envoylistener "github.com/envoyproxy/go-control-plane/envoy/api/v2/listener" envoyroute "github.com/envoyproxy/go-control-plane/envoy/api/v2/route" extauthz "github.com/envoyproxy/go-control-plane/envoy/config/filter/network/ext_authz/v2" envoyhttp "github.com/envoyproxy/go-control-plane/envoy/config/filter/network/http_connection_manager/v2" envoytcp "github.com/envoyproxy/go-control-plane/envoy/config/filter/network/tcp_proxy/v2" envoytype "github.com/envoyproxy/go-control-plane/envoy/type" "github.com/envoyproxy/go-control-plane/pkg/conversion" "github.com/envoyproxy/go-control-plane/pkg/wellknown" "github.com/golang/protobuf/jsonpb" "github.com/golang/protobuf/proto" "github.com/golang/protobuf/ptypes/any" pbstruct "github.com/golang/protobuf/ptypes/struct" "github.com/golang/protobuf/ptypes/wrappers" "github.com/hashicorp/consul/agent/connect" "github.com/hashicorp/consul/agent/proxycfg" "github.com/hashicorp/consul/agent/structs" "github.com/hashicorp/consul/logging" "github.com/hashicorp/go-hclog" ) // listenersFromSnapshot returns the xDS API representation of the "listeners" in the snapshot. func (s *Server) listenersFromSnapshot(cfgSnap *proxycfg.ConfigSnapshot, token string) ([]proto.Message, error) { if cfgSnap == nil { return nil, errors.New("nil config given") } switch cfgSnap.Kind { case structs.ServiceKindConnectProxy: return s.listenersFromSnapshotConnectProxy(cfgSnap, token) case structs.ServiceKindTerminatingGateway: return s.listenersFromSnapshotGateway(cfgSnap, token) case structs.ServiceKindMeshGateway: return s.listenersFromSnapshotGateway(cfgSnap, token) case structs.ServiceKindIngressGateway: return s.listenersFromSnapshotGateway(cfgSnap, token) default: return nil, fmt.Errorf("Invalid service kind: %v", cfgSnap.Kind) } } // listenersFromSnapshotConnectProxy returns the "listeners" for a connect proxy service func (s *Server) listenersFromSnapshotConnectProxy(cfgSnap *proxycfg.ConfigSnapshot, token string) ([]proto.Message, error) { // One listener for each upstream plus the public one resources := make([]proto.Message, len(cfgSnap.Proxy.Upstreams)+1) // Configure public listener var err error resources[0], err = s.makePublicListener(cfgSnap, token) if err != nil { return nil, err } for i, u := range cfgSnap.Proxy.Upstreams { id := u.Identifier() var chain *structs.CompiledDiscoveryChain if u.DestinationType != structs.UpstreamDestTypePreparedQuery { chain = cfgSnap.ConnectProxy.DiscoveryChain[id] } var upstreamListener proto.Message upstreamListener, err = s.makeUpstreamListenerForDiscoveryChain( &u, u.LocalBindAddress, chain, cfgSnap, nil, ) if err != nil { return nil, err } resources[i+1] = upstreamListener } cfgSnap.Proxy.Expose.Finalize() paths := cfgSnap.Proxy.Expose.Paths // Add service health checks to the list of paths to create listeners for if needed if cfgSnap.Proxy.Expose.Checks { psid := structs.NewServiceID(cfgSnap.Proxy.DestinationServiceID, &cfgSnap.ProxyID.EnterpriseMeta) for _, check := range s.CheckFetcher.ServiceHTTPBasedChecks(psid) { p, err := parseCheckPath(check) if err != nil { s.Logger.Warn("failed to create listener for", "check", check.CheckID, "error", err) continue } paths = append(paths, p) } } // Configure additional listener for exposed check paths for _, path := range paths { clusterName := LocalAppClusterName if path.LocalPathPort != cfgSnap.Proxy.LocalServicePort { clusterName = makeExposeClusterName(path.LocalPathPort) } l, err := s.makeExposedCheckListener(cfgSnap, clusterName, path) if err != nil { return nil, err } resources = append(resources, l) } return resources, nil } func parseCheckPath(check structs.CheckType) (structs.ExposePath, error) { var path structs.ExposePath if check.HTTP != "" { path.Protocol = "http" // Get path and local port from original HTTP target u, err := url.Parse(check.HTTP) if err != nil { return path, fmt.Errorf("failed to parse url '%s': %v", check.HTTP, err) } path.Path = u.Path _, portStr, err := net.SplitHostPort(u.Host) if err != nil { return path, fmt.Errorf("failed to parse port from '%s': %v", check.HTTP, err) } path.LocalPathPort, err = strconv.Atoi(portStr) if err != nil { return path, fmt.Errorf("failed to parse port from '%s': %v", check.HTTP, err) } // Get listener port from proxied HTTP target u, err = url.Parse(check.ProxyHTTP) if err != nil { return path, fmt.Errorf("failed to parse url '%s': %v", check.ProxyHTTP, err) } _, portStr, err = net.SplitHostPort(u.Host) if err != nil { return path, fmt.Errorf("failed to parse port from '%s': %v", check.ProxyHTTP, err) } path.ListenerPort, err = strconv.Atoi(portStr) if err != nil { return path, fmt.Errorf("failed to parse port from '%s': %v", check.ProxyHTTP, err) } } if check.GRPC != "" { path.Path = "/grpc.health.v1.Health/Check" path.Protocol = "http2" // Get local port from original GRPC target of the form: host/service proxyServerAndService := strings.SplitN(check.GRPC, "/", 2) _, portStr, err := net.SplitHostPort(proxyServerAndService[0]) if err != nil { return path, fmt.Errorf("failed to split host/port from '%s': %v", check.GRPC, err) } path.LocalPathPort, err = strconv.Atoi(portStr) if err != nil { return path, fmt.Errorf("failed to parse port from '%s': %v", check.GRPC, err) } // Get listener port from proxied GRPC target of the form: host/service proxyServerAndService = strings.SplitN(check.ProxyGRPC, "/", 2) _, portStr, err = net.SplitHostPort(proxyServerAndService[0]) if err != nil { return path, fmt.Errorf("failed to split host/port from '%s': %v", check.ProxyGRPC, err) } path.ListenerPort, err = strconv.Atoi(portStr) if err != nil { return path, fmt.Errorf("failed to parse port from '%s': %v", check.ProxyGRPC, err) } } path.ParsedFromCheck = true return path, nil } // listenersFromSnapshotGateway returns the "listener" for a terminating-gateway or mesh-gateway service func (s *Server) listenersFromSnapshotGateway(cfgSnap *proxycfg.ConfigSnapshot, token string) ([]proto.Message, error) { cfg, err := ParseGatewayConfig(cfgSnap.Proxy.Config) if err != nil { // Don't hard fail on a config typo, just warn. The parse func returns // default config if there is an error so it's safe to continue. s.Logger.Warn("failed to parse Connect.Proxy.Config", "error", err) } // Prevent invalid configurations of binding to the same port/addr twice // including with the any addresses type namedAddress struct { name string structs.ServiceAddress } seen := make(map[structs.ServiceAddress]bool) addrs := make([]namedAddress, 0) var resources []proto.Message if !cfg.NoDefaultBind { addr := cfgSnap.Address if addr == "" { addr = "0.0.0.0" } a := structs.ServiceAddress{ Address: addr, Port: cfgSnap.Port, } if !seen[a] { addrs = append(addrs, namedAddress{name: "default", ServiceAddress: a}) seen[a] = true } } if cfg.BindTaggedAddresses { for name, addrCfg := range cfgSnap.TaggedAddresses { a := structs.ServiceAddress{ Address: addrCfg.Address, Port: addrCfg.Port, } if !seen[a] { addrs = append(addrs, namedAddress{name: name, ServiceAddress: a}) seen[a] = true } } } for name, addrCfg := range cfg.BindAddresses { a := structs.ServiceAddress{ Address: addrCfg.Address, Port: addrCfg.Port, } if !seen[a] { addrs = append(addrs, namedAddress{name: name, ServiceAddress: a}) seen[a] = true } } // Make listeners once deduplicated for _, a := range addrs { var l *envoy.Listener switch cfgSnap.Kind { case structs.ServiceKindTerminatingGateway: l, err = s.makeTerminatingGatewayListener(a.name, a.Address, a.Port, cfgSnap, token) if err != nil { return nil, err } case structs.ServiceKindIngressGateway: listeners, err := s.makeIngressGatewayListeners(a.Address, cfgSnap) if err != nil { return nil, err } resources = append(resources, listeners...) case structs.ServiceKindMeshGateway: l, err = s.makeMeshGatewayListener(a.name, a.Address, a.Port, cfgSnap) if err != nil { return nil, err } } if l != nil { resources = append(resources, l) } } return resources, err } func (s *Server) makeIngressGatewayListeners(address string, cfgSnap *proxycfg.ConfigSnapshot) ([]proto.Message, error) { var resources []proto.Message for listenerKey, upstreams := range cfgSnap.IngressGateway.Upstreams { var tlsContext *envoyauth.DownstreamTlsContext if cfgSnap.IngressGateway.TLSEnabled { tlsContext = &envoyauth.DownstreamTlsContext{ CommonTlsContext: makeCommonTLSContextFromLeaf(cfgSnap, cfgSnap.Leaf()), RequireClientCertificate: &wrappers.BoolValue{Value: false}, } } if listenerKey.Protocol == "tcp" { // We rely on the invariant of upstreams slice always having at least 1 // member, because this key/value pair is created only when a // GatewayService is returned in the RPC u := upstreams[0] id := u.Identifier() chain := cfgSnap.IngressGateway.DiscoveryChain[id] var upstreamListener proto.Message upstreamListener, err := s.makeUpstreamListenerForDiscoveryChain( &u, address, chain, cfgSnap, tlsContext, ) if err != nil { return nil, err } resources = append(resources, upstreamListener) } else { // If multiple upstreams share this port, make a special listener for the protocol. listener := makeListener(listenerKey.Protocol, address, listenerKey.Port) filter, err := makeListenerFilter( true, listenerKey.Protocol, listenerKey.RouteName(), "", "ingress_upstream_", "", false) if err != nil { return nil, err } listener.FilterChains = []*envoylistener.FilterChain{ { Filters: []*envoylistener.Filter{ filter, }, TlsContext: tlsContext, }, } resources = append(resources, listener) } } return resources, nil } // makeListener returns a listener with name and bind details set. Filters must // be added before it's useful. // // Note on names: Envoy listeners attempt graceful transitions of connections // when their config changes but that means they can't have their bind address // or port changed in a running instance. Since our users might choose to change // a bind address or port for the public or upstream listeners, we need to // encode those into the unique name for the listener such that if the user // changes them, we actually create a whole new listener on the new address and // port. Envoy should take care of closing the old one once it sees it's no // longer in the config. func makeListener(name, addr string, port int) *envoy.Listener { return &envoy.Listener{ Name: fmt.Sprintf("%s:%s:%d", name, addr, port), Address: makeAddress(addr, port), } } // makeListenerFromUserConfig returns the listener config decoded from an // arbitrary proto3 json format string or an error if it's invalid. // // For now we only support embedding in JSON strings because of the hcl parsing // pain (see Background section in the comment for decode.HookWeakDecodeFromSlice). // This may be fixed in decode.HookWeakDecodeFromSlice in the future. // // When we do that we can support just nesting the config directly into the // JSON/hcl naturally but this is a stop-gap that gets us an escape hatch // immediately. It's also probably not a bad thing to support long-term since // any config generated by other systems will likely be in canonical protobuf // from rather than our slight variant in JSON/hcl. func makeListenerFromUserConfig(configJSON string) (*envoy.Listener, error) { // Figure out if there is an @type field. We don't require is since we know // this will be a listener but unmarshalling into any.Any fails if it's not // there and unmarshalling into listener directly fails if it is... var jsonFields map[string]*json.RawMessage if err := json.Unmarshal([]byte(configJSON), &jsonFields); err != nil { return nil, err } var l envoy.Listener if _, ok := jsonFields["@type"]; ok { // Type field is present so decode it as a any.Any var any any.Any err := jsonpb.UnmarshalString(configJSON, &any) if err != nil { return nil, err } // And then unmarshal the listener again... err = proto.Unmarshal(any.Value, &l) if err != nil { return nil, err } return &l, err } // No @type so try decoding as a straight listener. err := jsonpb.UnmarshalString(configJSON, &l) return &l, err } // Ensure that the first filter in each filter chain of a public listener is the // authz filter to prevent unauthorized access and that every filter chain uses // our TLS certs. We might allow users to work around this later if there is a // good use case but this is actually a feature for now as it allows them to // specify custom listener params in config but still get our certs delivered // dynamically and intentions enforced without coming up with some complicated // templating/merging solution. func injectConnectFilters(cfgSnap *proxycfg.ConfigSnapshot, token string, listener *envoy.Listener) error { authFilter, err := makeExtAuthFilter(token) if err != nil { return err } for idx := range listener.FilterChains { // Insert our authz filter before any others listener.FilterChains[idx].Filters = append([]*envoylistener.Filter{authFilter}, listener.FilterChains[idx].Filters...) listener.FilterChains[idx].TlsContext = &envoyauth.DownstreamTlsContext{ CommonTlsContext: makeCommonTLSContextFromLeaf(cfgSnap, cfgSnap.Leaf()), RequireClientCertificate: &wrappers.BoolValue{Value: true}, } } return nil } func (s *Server) makePublicListener(cfgSnap *proxycfg.ConfigSnapshot, token string) (proto.Message, error) { var l *envoy.Listener var err error cfg, err := ParseProxyConfig(cfgSnap.Proxy.Config) if err != nil { // Don't hard fail on a config typo, just warn. The parse func returns // default config if there is an error so it's safe to continue. s.Logger.Warn("failed to parse Connect.Proxy.Config", "error", err) } if cfg.PublicListenerJSON != "" { l, err = makeListenerFromUserConfig(cfg.PublicListenerJSON) if err != nil { return l, err } // In the happy path don't return yet as we need to inject TLS config still. } if l == nil { // No user config, use default listener addr := cfgSnap.Address // Override with bind address if one is set, otherwise default // to 0.0.0.0 if cfg.BindAddress != "" { addr = cfg.BindAddress } else if addr == "" { addr = "0.0.0.0" } // Override with bind port if one is set, otherwise default to // proxy service's address port := cfgSnap.Port if cfg.BindPort != 0 { port = cfg.BindPort } l = makeListener(PublicListenerName, addr, port) filter, err := makeListenerFilter( false, cfg.Protocol, "public_listener", LocalAppClusterName, "", "", true) if err != nil { return nil, err } l.FilterChains = []*envoylistener.FilterChain{ { Filters: []*envoylistener.Filter{ filter, }, }, } } err = injectConnectFilters(cfgSnap, token, l) return l, err } func (s *Server) makeExposedCheckListener(cfgSnap *proxycfg.ConfigSnapshot, cluster string, path structs.ExposePath) (proto.Message, error) { cfg, err := ParseProxyConfig(cfgSnap.Proxy.Config) if err != nil { // Don't hard fail on a config typo, just warn. The parse func returns // default config if there is an error so it's safe to continue. s.Logger.Warn("failed to parse Connect.Proxy.Config", "error", err) } // No user config, use default listener addr := cfgSnap.Address // Override with bind address if one is set, otherwise default to 0.0.0.0 if cfg.BindAddress != "" { addr = cfg.BindAddress } else if addr == "" { addr = "0.0.0.0" } // Strip any special characters from path to make a valid and hopefully unique name r := regexp.MustCompile(`[^a-zA-Z0-9]+`) strippedPath := r.ReplaceAllString(path.Path, "") listenerName := fmt.Sprintf("exposed_path_%s", strippedPath) l := makeListener(listenerName, addr, path.ListenerPort) filterName := fmt.Sprintf("exposed_path_filter_%s_%d", strippedPath, path.ListenerPort) f, err := makeListenerFilter(false, path.Protocol, filterName, cluster, "", path.Path, true) if err != nil { return nil, err } chain := &envoylistener.FilterChain{ Filters: []*envoylistener.Filter{f}, } // For registered checks restrict traffic sources to localhost and Consul's advertise addr if path.ParsedFromCheck { // For the advertise addr we use a CidrRange that only matches one address advertise := s.CfgFetcher.AdvertiseAddrLAN() // Get prefix length based on whether address is ipv4 (32 bits) or ipv6 (128 bits) advertiseLen := 32 ip := net.ParseIP(advertise) if ip != nil && strings.Contains(advertise, ":") { advertiseLen = 128 } chain.FilterChainMatch = &envoylistener.FilterChainMatch{ SourcePrefixRanges: []*envoycore.CidrRange{ {AddressPrefix: "127.0.0.1", PrefixLen: &wrappers.UInt32Value{Value: 8}}, {AddressPrefix: "::1", PrefixLen: &wrappers.UInt32Value{Value: 128}}, {AddressPrefix: advertise, PrefixLen: &wrappers.UInt32Value{Value: uint32(advertiseLen)}}, }, } } l.FilterChains = []*envoylistener.FilterChain{chain} return l, err } func (s *Server) makeTerminatingGatewayListener(name, addr string, port int, cfgSnap *proxycfg.ConfigSnapshot, token string) (*envoy.Listener, error) { l := makeListener(name, addr, port) tlsInspector, err := makeTLSInspectorListenerFilter() if err != nil { return nil, err } l.ListenerFilters = []*envoylistener.ListenerFilter{tlsInspector} // Make a FilterChain for each linked service // Match on the cluster name, for svc := range cfgSnap.TerminatingGateway.ServiceGroups { clusterName := connect.ServiceSNI(svc.Name, "", svc.NamespaceOrDefault(), cfgSnap.Datacenter, cfgSnap.Roots.TrustDomain) resolver, hasResolver := cfgSnap.TerminatingGateway.ServiceResolvers[svc] // Skip the service if we don't have a cert to present for mTLS if cert, ok := cfgSnap.TerminatingGateway.ServiceLeaves[svc]; !ok || cert == nil { // TODO (gateways) (freddy) Should the error suggest that the issue may be ACLs? (need service:write on service) s.Logger.Named(logging.TerminatingGateway). Error("no client certificate available for linked service, skipping filter chain creation", "service", svc.String(), "error", err) continue } clusterChain, err := s.sniFilterChainTerminatingGateway(name, clusterName, token, svc, cfgSnap) if err != nil { return nil, fmt.Errorf("failed to make filter chain for cluster %q: %v", clusterName, err) } l.FilterChains = append(l.FilterChains, clusterChain) // if there is a service-resolver for this service then also setup subset filter chains for it if hasResolver { // generate 1 filter chain for each service subset for subsetName := range resolver.Subsets { clusterName := connect.ServiceSNI(svc.Name, subsetName, svc.NamespaceOrDefault(), cfgSnap.Datacenter, cfgSnap.Roots.TrustDomain) clusterChain, err := s.sniFilterChainTerminatingGateway(name, clusterName, token, svc, cfgSnap) if err != nil { return nil, fmt.Errorf("failed to make filter chain for cluster %q: %v", clusterName, err) } l.FilterChains = append(l.FilterChains, clusterChain) } } } // This fallback catch-all filter ensures a listener will be present for health checks to pass // Envoy will reset these connections since known endpoints are caught by filter chain matches above tcpProxy, err := makeTCPProxyFilter(name, "", "terminating_gateway_") if err != nil { return nil, err } fallback := &envoylistener.FilterChain{ Filters: []*envoylistener.Filter{ {Name: "envoy.filters.network.sni_cluster"}, tcpProxy, }, } l.FilterChains = append(l.FilterChains, fallback) return l, nil } func (s *Server) sniFilterChainTerminatingGateway(listener, cluster, token string, service structs.ServiceName, cfgSnap *proxycfg.ConfigSnapshot) (*envoylistener.FilterChain, error) { authFilter, err := makeExtAuthFilter(token) if err != nil { return nil, err } sniCluster, err := makeSNIClusterFilter() if err != nil { return nil, err } // The cluster name here doesn't matter as the sni_cluster filter will fill it in for us. statPrefix := fmt.Sprintf("terminating_gateway_%s_%s_", service.NamespaceOrDefault(), service.Name) tcpProxy, err := makeTCPProxyFilter(listener, "", statPrefix) if err != nil { return nil, err } return &envoylistener.FilterChain{ FilterChainMatch: makeSNIFilterChainMatch(cluster), Filters: []*envoylistener.Filter{ authFilter, sniCluster, tcpProxy, }, TlsContext: &envoyauth.DownstreamTlsContext{ CommonTlsContext: makeCommonTLSContextFromLeaf(cfgSnap, cfgSnap.TerminatingGateway.ServiceLeaves[service]), RequireClientCertificate: &wrappers.BoolValue{Value: true}, }, }, err } func (s *Server) makeMeshGatewayListener(name, addr string, port int, cfgSnap *proxycfg.ConfigSnapshot) (*envoy.Listener, error) { tlsInspector, err := makeTLSInspectorListenerFilter() if err != nil { return nil, err } sniCluster, err := makeSNIClusterFilter() if err != nil { return nil, err } // The cluster name here doesn't matter as the sni_cluster // filter will fill it in for us. tcpProxy, err := makeTCPProxyFilter(name, "", "mesh_gateway_local_") if err != nil { return nil, err } sniClusterChain := &envoylistener.FilterChain{ Filters: []*envoylistener.Filter{ sniCluster, tcpProxy, }, } l := makeListener(name, addr, port) l.ListenerFilters = []*envoylistener.ListenerFilter{tlsInspector} // TODO (mesh-gateway) - Do we need to create clusters for all the old trust domains as well? // We need 1 Filter Chain per datacenter datacenters := cfgSnap.MeshGateway.Datacenters() for _, dc := range datacenters { if dc == cfgSnap.Datacenter { continue // skip local } clusterName := connect.DatacenterSNI(dc, cfgSnap.Roots.TrustDomain) filterName := fmt.Sprintf("%s_%s", name, dc) dcTCPProxy, err := makeTCPProxyFilter(filterName, clusterName, "mesh_gateway_remote_") if err != nil { return nil, err } l.FilterChains = append(l.FilterChains, &envoylistener.FilterChain{ FilterChainMatch: &envoylistener.FilterChainMatch{ ServerNames: []string{fmt.Sprintf("*.%s", clusterName)}, }, Filters: []*envoylistener.Filter{ dcTCPProxy, }, }) } if cfgSnap.ServiceMeta[structs.MetaWANFederationKey] == "1" && cfgSnap.ServerSNIFn != nil { for _, dc := range datacenters { if dc == cfgSnap.Datacenter { continue // skip local } clusterName := cfgSnap.ServerSNIFn(dc, "") filterName := fmt.Sprintf("%s_%s", name, dc) dcTCPProxy, err := makeTCPProxyFilter(filterName, clusterName, "mesh_gateway_remote_") if err != nil { return nil, err } l.FilterChains = append(l.FilterChains, &envoylistener.FilterChain{ FilterChainMatch: &envoylistener.FilterChainMatch{ ServerNames: []string{fmt.Sprintf("*.%s", clusterName)}, }, Filters: []*envoylistener.Filter{ dcTCPProxy, }, }) } // Wildcard all flavors to each server. for _, srv := range cfgSnap.MeshGateway.ConsulServers { clusterName := cfgSnap.ServerSNIFn(cfgSnap.Datacenter, srv.Node.Node) filterName := fmt.Sprintf("%s_%s", name, cfgSnap.Datacenter) dcTCPProxy, err := makeTCPProxyFilter(filterName, clusterName, "mesh_gateway_local_server_") if err != nil { return nil, err } l.FilterChains = append(l.FilterChains, &envoylistener.FilterChain{ FilterChainMatch: &envoylistener.FilterChainMatch{ ServerNames: []string{fmt.Sprintf("%s", clusterName)}, }, Filters: []*envoylistener.Filter{ dcTCPProxy, }, }) } } // This needs to get tacked on at the end as it has no // matching and will act as a catch all l.FilterChains = append(l.FilterChains, sniClusterChain) return l, nil } func (s *Server) makeUpstreamListenerForDiscoveryChain( u *structs.Upstream, address string, chain *structs.CompiledDiscoveryChain, cfgSnap *proxycfg.ConfigSnapshot, tlsContext *envoyauth.DownstreamTlsContext, ) (proto.Message, error) { if address == "" { address = "127.0.0.1" } upstreamID := u.Identifier() l := makeListener(upstreamID, address, u.LocalBindPort) cfg := getAndModifyUpstreamConfigForListener(s.Logger, u, chain) if cfg.ListenerJSON != "" { return makeListenerFromUserConfig(cfg.ListenerJSON) } useRDS := true clusterName := "" if chain == nil || chain.IsDefault() { dc := u.Datacenter if dc == "" { dc = cfgSnap.Datacenter } sni := connect.UpstreamSNI(u, "", dc, cfgSnap.Roots.TrustDomain) useRDS = false clusterName = CustomizeClusterName(sni, chain) } else if cfg.Protocol == "tcp" { startNode := chain.Nodes[chain.StartNode] if startNode == nil { panic("missing first node in compiled discovery chain for: " + chain.ServiceName) } else if startNode.Type != structs.DiscoveryGraphNodeTypeResolver { panic(fmt.Sprintf("unexpected first node in discovery chain using protocol=%q: %s", cfg.Protocol, startNode.Type)) } targetID := startNode.Resolver.Target target := chain.Targets[targetID] useRDS = false clusterName = CustomizeClusterName(target.Name, chain) } filter, err := makeListenerFilter( useRDS, cfg.Protocol, upstreamID, clusterName, "upstream_", "", false) if err != nil { return nil, err } l.FilterChains = []*envoylistener.FilterChain{ { Filters: []*envoylistener.Filter{ filter, }, TlsContext: tlsContext, }, } return l, nil } func getAndModifyUpstreamConfigForListener(logger hclog.Logger, u *structs.Upstream, chain *structs.CompiledDiscoveryChain) UpstreamConfig { var ( cfg UpstreamConfig err error ) if chain == nil || chain.IsDefault() { cfg, err = ParseUpstreamConfig(u.Config) if err != nil { // Don't hard fail on a config typo, just warn. The parse func returns // default config if there is an error so it's safe to continue. logger.Warn("failed to parse", "upstream", u.Identifier(), "error", err) } } else { // Use NoDefaults here so that we can set the protocol to the chain // protocol if necessary cfg, err = ParseUpstreamConfigNoDefaults(u.Config) if err != nil { // Don't hard fail on a config typo, just warn. The parse func returns // default config if there is an error so it's safe to continue. logger.Warn("failed to parse", "upstream", u.Identifier(), "error", err) } if cfg.ListenerJSON != "" { logger.Warn("ignoring escape hatch setting because already configured for", "discovery chain", chain.ServiceName, "upstream", u.Identifier(), "config", "envoy_listener_json") // Remove from config struct so we don't use it later on cfg.ListenerJSON = "" } proto := cfg.Protocol if proto == "" { proto = chain.Protocol } if proto == "" { proto = "tcp" } // set back on the config so that we can use it from return value cfg.Protocol = proto } return cfg } func makeListenerFilter( useRDS bool, protocol, filterName, cluster, statPrefix, routePath string, ingress bool) (*envoylistener.Filter, error) { switch protocol { case "grpc": return makeHTTPFilter(useRDS, filterName, cluster, statPrefix, routePath, ingress, true, true) case "http2": return makeHTTPFilter(useRDS, filterName, cluster, statPrefix, routePath, ingress, false, true) case "http": return makeHTTPFilter(useRDS, filterName, cluster, statPrefix, routePath, ingress, false, false) case "tcp": fallthrough default: if useRDS { return nil, fmt.Errorf("RDS is not compatible with the tcp proxy filter") } else if cluster == "" { return nil, fmt.Errorf("cluster name is required for a tcp proxy filter") } return makeTCPProxyFilter(filterName, cluster, statPrefix) } } func makeTLSInspectorListenerFilter() (*envoylistener.ListenerFilter, error) { return &envoylistener.ListenerFilter{Name: wellknown.TlsInspector}, nil } func makeSNIFilterChainMatch(sniMatch string) *envoylistener.FilterChainMatch { return &envoylistener.FilterChainMatch{ ServerNames: []string{sniMatch}, } } func makeSNIClusterFilter() (*envoylistener.Filter, error) { // This filter has no config which is why we are not calling make return &envoylistener.Filter{Name: "envoy.filters.network.sni_cluster"}, nil } func makeTCPProxyFilter(filterName, cluster, statPrefix string) (*envoylistener.Filter, error) { cfg := &envoytcp.TcpProxy{ StatPrefix: makeStatPrefix("tcp", statPrefix, filterName), ClusterSpecifier: &envoytcp.TcpProxy_Cluster{Cluster: cluster}, } return makeFilter("envoy.tcp_proxy", cfg) } func makeStatPrefix(protocol, prefix, filterName string) string { // Replace colons here because Envoy does that in the metrics for the actual // clusters but doesn't in the stat prefix here while dashboards assume they // will match. return fmt.Sprintf("%s%s_%s", prefix, strings.Replace(filterName, ":", "_", -1), protocol) } func makeHTTPFilter( useRDS bool, filterName, cluster, statPrefix, routePath string, ingress, grpc, http2 bool, ) (*envoylistener.Filter, error) { op := envoyhttp.HttpConnectionManager_Tracing_INGRESS if !ingress { op = envoyhttp.HttpConnectionManager_Tracing_EGRESS } proto := "http" if grpc { proto = "grpc" } cfg := &envoyhttp.HttpConnectionManager{ StatPrefix: makeStatPrefix(proto, statPrefix, filterName), CodecType: envoyhttp.HttpConnectionManager_AUTO, HttpFilters: []*envoyhttp.HttpFilter{ { Name: "envoy.router", }, }, Tracing: &envoyhttp.HttpConnectionManager_Tracing{ OperationName: op, // Don't trace any requests by default unless the client application // explicitly propagates trace headers that indicate this should be // sampled. RandomSampling: &envoytype.Percent{Value: 0.0}, }, } if useRDS { if cluster != "" { return nil, fmt.Errorf("cannot specify cluster name when using RDS") } cfg.RouteSpecifier = &envoyhttp.HttpConnectionManager_Rds{ Rds: &envoyhttp.Rds{ RouteConfigName: filterName, ConfigSource: &envoycore.ConfigSource{ ConfigSourceSpecifier: &envoycore.ConfigSource_Ads{ Ads: &envoycore.AggregatedConfigSource{}, }, }, }, } } else { if cluster == "" { return nil, fmt.Errorf("must specify cluster name when not using RDS") } route := &envoyroute.Route{ Match: &envoyroute.RouteMatch{ PathSpecifier: &envoyroute.RouteMatch_Prefix{ Prefix: "/", }, // TODO(banks) Envoy supports matching only valid GRPC // requests which might be nice to add here for gRPC services // but it's not supported in our current envoy SDK version // although docs say it was supported by 1.8.0. Going to defer // that until we've updated the deps. }, Action: &envoyroute.Route_Route{ Route: &envoyroute.RouteAction{ ClusterSpecifier: &envoyroute.RouteAction_Cluster{ Cluster: cluster, }, }, }, } // If a path is provided, do not match on a catch-all prefix if routePath != "" { route.Match.PathSpecifier = &envoyroute.RouteMatch_Path{Path: routePath} } cfg.RouteSpecifier = &envoyhttp.HttpConnectionManager_RouteConfig{ RouteConfig: &envoy.RouteConfiguration{ Name: filterName, VirtualHosts: []*envoyroute.VirtualHost{ { Name: filterName, Domains: []string{"*"}, Routes: []*envoyroute.Route{ route, }, }, }, }, } } if http2 { cfg.Http2ProtocolOptions = &envoycore.Http2ProtocolOptions{} } if grpc { // Add grpc bridge before router cfg.HttpFilters = append([]*envoyhttp.HttpFilter{{ Name: "envoy.grpc_http1_bridge", ConfigType: &envoyhttp.HttpFilter_Config{Config: &pbstruct.Struct{}}, }}, cfg.HttpFilters...) } return makeFilter("envoy.http_connection_manager", cfg) } func makeExtAuthFilter(token string) (*envoylistener.Filter, error) { cfg := &extauthz.ExtAuthz{ StatPrefix: "connect_authz", GrpcService: &envoycore.GrpcService{ // Attach token header so we can authorize the callbacks. Technically // authorize is not really protected data but we locked down the HTTP // implementation to need service:write and since we have the token that // has that it's pretty reasonable to set it up here. InitialMetadata: []*envoycore.HeaderValue{ { Key: "x-consul-token", Value: token, }, }, TargetSpecifier: &envoycore.GrpcService_EnvoyGrpc_{ EnvoyGrpc: &envoycore.GrpcService_EnvoyGrpc{ ClusterName: LocalAgentClusterName, }, }, }, FailureModeAllow: false, } return makeFilter("envoy.ext_authz", cfg) } func makeFilter(name string, cfg proto.Message) (*envoylistener.Filter, error) { // Ridiculous dance to make that struct into pbstruct.Struct by... encoding it // as JSON and decoding again!! cfgStruct, err := conversion.MessageToStruct(cfg) if err != nil { return nil, err } return &envoylistener.Filter{ Name: name, ConfigType: &envoylistener.Filter_Config{Config: cfgStruct}, }, nil } func makeCommonTLSContextFromLeaf(cfgSnap *proxycfg.ConfigSnapshot, leaf *structs.IssuedCert) *envoyauth.CommonTlsContext { // Concatenate all the root PEMs into one. // TODO(banks): verify this actually works with Envoy (docs are not clear). rootPEMS := "" if cfgSnap.Roots == nil { return nil } for _, root := range cfgSnap.Roots.Roots { rootPEMS += root.RootCert } return &envoyauth.CommonTlsContext{ TlsParams: &envoyauth.TlsParameters{}, TlsCertificates: []*envoyauth.TlsCertificate{ { CertificateChain: &envoycore.DataSource{ Specifier: &envoycore.DataSource_InlineString{ InlineString: leaf.CertPEM, }, }, PrivateKey: &envoycore.DataSource{ Specifier: &envoycore.DataSource_InlineString{ InlineString: leaf.PrivateKeyPEM, }, }, }, }, ValidationContextType: &envoyauth.CommonTlsContext_ValidationContext{ ValidationContext: &envoyauth.CertificateValidationContext{ // TODO(banks): later for L7 support we may need to configure ALPN here. TrustedCa: &envoycore.DataSource{ Specifier: &envoycore.DataSource_InlineString{ InlineString: rootPEMS, }, }, }, }, } } func makeCommonTLSContextFromFiles(caFile, certFile, keyFile string) *envoyauth.CommonTlsContext { ctx := envoyauth.CommonTlsContext{ TlsParams: &envoyauth.TlsParameters{}, } // Verify certificate of peer if caFile is specified if caFile != "" { ctx.ValidationContextType = &envoyauth.CommonTlsContext_ValidationContext{ ValidationContext: &envoyauth.CertificateValidationContext{ TrustedCa: &envoycore.DataSource{ Specifier: &envoycore.DataSource_Filename{ Filename: caFile, }, }, }, } } // Present certificate for mTLS if cert and key files are specified if certFile != "" && keyFile != "" { ctx.TlsCertificates = []*envoyauth.TlsCertificate{ { CertificateChain: &envoycore.DataSource{ Specifier: &envoycore.DataSource_Filename{ Filename: certFile, }, }, PrivateKey: &envoycore.DataSource{ Specifier: &envoycore.DataSource_Filename{ Filename: keyFile, }, }, }, } } return &ctx }