package xds import ( "encoding/json" "errors" "fmt" "net" "net/url" "regexp" "strconv" "strings" "time" 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" 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" pbtypes "github.com/golang/protobuf/ptypes" "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(cInfo connectionInfo, cfgSnap *proxycfg.ConfigSnapshot) ([]proto.Message, error) { if cfgSnap == nil { return nil, errors.New("nil config given") } switch cfgSnap.Kind { case structs.ServiceKindConnectProxy: return s.listenersFromSnapshotConnectProxy(cInfo, cfgSnap) case structs.ServiceKindTerminatingGateway: return s.listenersFromSnapshotGateway(cInfo, cfgSnap) case structs.ServiceKindMeshGateway: return s.listenersFromSnapshotGateway(cInfo, cfgSnap) case structs.ServiceKindIngressGateway: return s.listenersFromSnapshotGateway(cInfo, cfgSnap) default: return nil, fmt.Errorf("Invalid service kind: %v", cfgSnap.Kind) } } // listenersFromSnapshotConnectProxy returns the "listeners" for a connect proxy service func (s *Server) listenersFromSnapshotConnectProxy(cInfo connectionInfo, cfgSnap *proxycfg.ConfigSnapshot) ([]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(cInfo, cfgSnap) 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(cInfo connectionInfo, cfgSnap *proxycfg.ConfigSnapshot) ([]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(cInfo, cfgSnap, a.name, a.Address, a.Port) 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) opts := listenerFilterOpts{ useRDS: true, protocol: listenerKey.Protocol, filterName: listenerKey.RouteName(), routeName: listenerKey.RouteName(), cluster: "", statPrefix: "ingress_upstream.", routePath: "", ingress: false, httpAuthzFilter: nil, } filter, err := makeListenerFilter(opts) 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. func (s *Server) injectConnectFilters(_ connectionInfo, cfgSnap *proxycfg.ConfigSnapshot, listener *envoy.Listener) error { authzFilter, err := makeRBACNetworkFilter( cfgSnap.ConnectProxy.Intentions, cfgSnap.IntentionDefaultAllow, ) if err != nil { return err } for idx := range listener.FilterChains { // Insert our authz filter before any others listener.FilterChains[idx].Filters = append([]*envoylistener.Filter{ authzFilter, }, listener.FilterChains[idx].Filters...) } return nil } const httpConnectionManagerNewName = "envoy.filters.network.http_connection_manager" // Locate the existing http connect manager L4 filter and inject our RBAC filter at the top. func (s *Server) injectHTTPFilterOnFilterChains( listener *envoy.Listener, authzFilter *envoyhttp.HttpFilter, ) error { for chainIdx, chain := range listener.FilterChains { var ( hcmFilter *envoylistener.Filter hcmFilterIdx int ) for filterIdx, filter := range chain.Filters { if filter.Name == wellknown.HTTPConnectionManager || filter.Name == httpConnectionManagerNewName { hcmFilter = filter hcmFilterIdx = filterIdx break } } if hcmFilter == nil { return fmt.Errorf( "filter chain %d lacks either a %q or %q filter", chainIdx, wellknown.HTTPConnectionManager, httpConnectionManagerNewName, ) } var ( hcm envoyhttp.HttpConnectionManager isTyped bool ) switch x := hcmFilter.ConfigType.(type) { case *envoylistener.Filter_Config: if err := conversion.StructToMessage(x.Config, &hcm); err != nil { return err } isTyped = false case *envoylistener.Filter_TypedConfig: if err := pbtypes.UnmarshalAny(x.TypedConfig, &hcm); err != nil { return err } isTyped = true default: return fmt.Errorf( "filter chain %d has a %q filter with an unsupported config type: %T", chainIdx, hcmFilter.Name, x, ) } // Insert our authz filter before any others hcm.HttpFilters = append([]*envoyhttp.HttpFilter{ authzFilter, }, hcm.HttpFilters...) // And persist the modified filter. newFilter, err := makeFilter(hcmFilter.Name, &hcm, isTyped) if err != nil { return err } chain.Filters[hcmFilterIdx] = newFilter } return nil } // Ensure 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 (s *Server) injectConnectTLSOnFilterChains(_ connectionInfo, cfgSnap *proxycfg.ConfigSnapshot, listener *envoy.Listener) error { for idx := range listener.FilterChains { listener.FilterChains[idx].TlsContext = &envoyauth.DownstreamTlsContext{ CommonTlsContext: makeCommonTLSContextFromLeaf(cfgSnap, cfgSnap.Leaf()), RequireClientCertificate: &wrappers.BoolValue{Value: true}, } } return nil } func (s *Server) makePublicListener(cInfo connectionInfo, cfgSnap *proxycfg.ConfigSnapshot) (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 and authz config still. } // This controls if we do L4 or L7 intention checks. useHTTPFilter := structs.IsProtocolHTTPLike(cfg.Protocol) 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) opts := listenerFilterOpts{ useRDS: false, protocol: cfg.Protocol, filterName: "public_listener", routeName: "public_listener", cluster: LocalAppClusterName, statPrefix: "", routePath: "", ingress: true, requestTimeoutMs: cfg.LocalRequestTimeoutMs, } if useHTTPFilter { opts.httpAuthzFilter, err = makeRBACHTTPFilter( cfgSnap.ConnectProxy.Intentions, cfgSnap.IntentionDefaultAllow, ) if err != nil { return nil, err } } filter, err := makeListenerFilter(opts) if err != nil { return nil, err } l.FilterChains = []*envoylistener.FilterChain{ { Filters: []*envoylistener.Filter{ filter, }, }, } } else if useHTTPFilter { httpAuthzFilter, err := makeRBACHTTPFilter( cfgSnap.ConnectProxy.Intentions, cfgSnap.IntentionDefaultAllow, ) if err != nil { return nil, err } // We're using the listener escape hatch, so try our best to inject the // HTTP RBAC filter, but if we can't then just inject the RBAC Network // filter instead. if err := s.injectHTTPFilterOnFilterChains(l, httpAuthzFilter); err != nil { s.Logger.Warn( "could not inject the HTTP RBAC filter to enforce intentions on user-provided 'envoy_public_listener_json' config; falling back on the RBAC network filter instead", "proxy", cfgSnap.ProxyID, "error", err, ) useHTTPFilter = false } } if !useHTTPFilter { if err := s.injectConnectFilters(cInfo, cfgSnap, l); err != nil { return nil, err } } if err := s.injectConnectTLSOnFilterChains(cInfo, cfgSnap, l); err != nil { return nil, err } 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) opts := listenerFilterOpts{ useRDS: false, protocol: path.Protocol, filterName: filterName, routeName: filterName, cluster: cluster, statPrefix: "", routePath: path.Path, ingress: true, httpAuthzFilter: nil, } f, err := makeListenerFilter(opts) 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( cInfo connectionInfo, cfgSnap *proxycfg.ConfigSnapshot, name, addr string, port int, ) (*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.ValidServices() { clusterName := connect.ServiceSNI(svc.Name, "", svc.NamespaceOrDefault(), cfgSnap.Datacenter, cfgSnap.Roots.TrustDomain) // Resolvers are optional. resolver, hasResolver := cfgSnap.TerminatingGateway.ServiceResolvers[svc] intentions := cfgSnap.TerminatingGateway.Intentions[svc] svcConfig := cfgSnap.TerminatingGateway.ServiceConfigs[svc] cfg, err := ParseProxyConfig(svcConfig.ProxyConfig) 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.Named(logging.TerminatingGateway).Warn( "failed to parse Connect.Proxy.Config for linked service", "service", svc.String(), "error", err, ) } clusterChain, err := s.makeFilterChainTerminatingGateway( cInfo, cfgSnap, name, clusterName, svc, intentions, cfg.Protocol, ) 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 { subsetClusterName := connect.ServiceSNI(svc.Name, subsetName, svc.NamespaceOrDefault(), cfgSnap.Datacenter, cfgSnap.Roots.TrustDomain) subsetClusterChain, err := s.makeFilterChainTerminatingGateway( cInfo, cfgSnap, name, subsetClusterName, svc, intentions, cfg.Protocol, ) if err != nil { return nil, fmt.Errorf("failed to make filter chain for cluster %q: %v", subsetClusterName, err) } l.FilterChains = append(l.FilterChains, subsetClusterChain) } } } // 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) makeFilterChainTerminatingGateway( _ connectionInfo, cfgSnap *proxycfg.ConfigSnapshot, listener, cluster string, service structs.ServiceName, intentions structs.Intentions, protocol string, ) (*envoylistener.FilterChain, error) { filterChain := &envoylistener.FilterChain{ FilterChainMatch: makeSNIFilterChainMatch(cluster), Filters: make([]*envoylistener.Filter, 0, 3), TlsContext: &envoyauth.DownstreamTlsContext{ CommonTlsContext: makeCommonTLSContextFromLeaf(cfgSnap, cfgSnap.TerminatingGateway.ServiceLeaves[service]), RequireClientCertificate: &wrappers.BoolValue{Value: true}, }, } // This controls if we do L4 or L7 intention checks. useHTTPFilter := structs.IsProtocolHTTPLike(protocol) // If this is L4, the first filter we setup is to do intention checks. if !useHTTPFilter { authFilter, err := makeRBACNetworkFilter( intentions, cfgSnap.IntentionDefaultAllow, ) if err != nil { return nil, err } filterChain.Filters = append(filterChain.Filters, authFilter) } // Lastly we setup the actual proxying component. For L4 this is a straight // tcp proxy. For L7 this is a very hands-off HTTP proxy just to inject an // HTTP filter to do intention checks here instead. statPrefix := fmt.Sprintf("terminating_gateway.%s.%s.", service.NamespaceOrDefault(), service.Name) opts := listenerFilterOpts{ protocol: protocol, filterName: listener, routeName: cluster, // Set cluster name for route config since each will have its own cluster: cluster, statPrefix: statPrefix, routePath: "", ingress: false, } if useHTTPFilter { var err error opts.httpAuthzFilter, err = makeRBACHTTPFilter( intentions, cfgSnap.IntentionDefaultAllow, ) if err != nil { return nil, err } opts.cluster = "" opts.useRDS = true } filter, err := makeListenerFilter(opts) if err != nil { return nil, err } filterChain.Filters = append(filterChain.Filters, filter) return filterChain, nil } 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 var ( clusterName string destination, datacenter, namespace string ) if chain == nil || chain.IsDefault() { useRDS = false dc := u.Datacenter if dc == "" { dc = cfgSnap.Datacenter } destination, datacenter, namespace = u.DestinationName, dc, u.DestinationNamespace sni := connect.UpstreamSNI(u, "", dc, cfgSnap.Roots.TrustDomain) clusterName = CustomizeClusterName(sni, chain) } else { destination, datacenter, namespace = chain.ServiceName, chain.Datacenter, chain.Namespace if cfg.Protocol == "tcp" { useRDS = false startNode := chain.Nodes[chain.StartNode] if startNode == nil { return nil, fmt.Errorf("missing first node in compiled discovery chain for: %s", chain.ServiceName) } if startNode.Type != structs.DiscoveryGraphNodeTypeResolver { return nil, fmt.Errorf("unexpected first node in discovery chain using protocol=%q: %s", cfg.Protocol, startNode.Type) } targetID := startNode.Resolver.Target target := chain.Targets[targetID] clusterName = CustomizeClusterName(target.Name, chain) } } // Default the namespace to match how SNIs are generated if namespace == "" { namespace = structs.IntentionDefaultNamespace } filterName := fmt.Sprintf("%s.%s.%s", destination, namespace, datacenter) if u.DestinationType == structs.UpstreamDestTypePreparedQuery { // Avoid encoding dc and namespace for prepared queries. // Those are defined in the query itself and are not available here. filterName = upstreamID } opts := listenerFilterOpts{ useRDS: useRDS, protocol: cfg.Protocol, filterName: filterName, routeName: upstreamID, cluster: clusterName, statPrefix: "upstream.", routePath: "", ingress: false, httpAuthzFilter: nil, } filter, err := makeListenerFilter(opts) 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 } type listenerFilterOpts struct { useRDS bool protocol string filterName string routeName string cluster string statPrefix string routePath string ingress bool requestTimeoutMs *int httpAuthzFilter *envoyhttp.HttpFilter } func makeListenerFilter(opts listenerFilterOpts) (*envoylistener.Filter, error) { switch opts.protocol { case "grpc", "http2", "http": return makeHTTPFilter(opts) case "tcp": fallthrough default: if opts.useRDS { return nil, fmt.Errorf("RDS is not compatible with the tcp proxy filter") } else if opts.cluster == "" { return nil, fmt.Errorf("cluster name is required for a tcp proxy filter") } return makeTCPProxyFilter(opts.filterName, opts.cluster, opts.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(statPrefix, filterName), ClusterSpecifier: &envoytcp.TcpProxy_Cluster{Cluster: cluster}, } return makeFilter("envoy.tcp_proxy", cfg, false) } func makeStatPrefix(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", prefix, strings.Replace(filterName, ":", "_", -1)) } func makeHTTPFilter(opts listenerFilterOpts) (*envoylistener.Filter, error) { op := envoyhttp.HttpConnectionManager_Tracing_INGRESS if !opts.ingress { op = envoyhttp.HttpConnectionManager_Tracing_EGRESS } cfg := &envoyhttp.HttpConnectionManager{ StatPrefix: makeStatPrefix(opts.statPrefix, opts.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 opts.useRDS { if opts.cluster != "" { return nil, fmt.Errorf("cannot specify cluster name when using RDS") } cfg.RouteSpecifier = &envoyhttp.HttpConnectionManager_Rds{ Rds: &envoyhttp.Rds{ RouteConfigName: opts.routeName, ConfigSource: &envoycore.ConfigSource{ ConfigSourceSpecifier: &envoycore.ConfigSource_Ads{ Ads: &envoycore.AggregatedConfigSource{}, }, }, }, } } else { if opts.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: opts.cluster, }, }, }, } if opts.requestTimeoutMs != nil { r := route.GetRoute() r.Timeout = pbtypes.DurationProto(time.Duration(*opts.requestTimeoutMs) * time.Millisecond) } // If a path is provided, do not match on a catch-all prefix if opts.routePath != "" { route.Match.PathSpecifier = &envoyroute.RouteMatch_Path{Path: opts.routePath} } cfg.RouteSpecifier = &envoyhttp.HttpConnectionManager_RouteConfig{ RouteConfig: &envoy.RouteConfiguration{ Name: opts.routeName, VirtualHosts: []*envoyroute.VirtualHost{ { Name: opts.filterName, Domains: []string{"*"}, Routes: []*envoyroute.Route{ route, }, }, }, }, } } if opts.protocol == "http2" || opts.protocol == "grpc" { cfg.Http2ProtocolOptions = &envoycore.Http2ProtocolOptions{} } // Like injectConnectFilters for L4, here we ensure that the first filter // (other than the "envoy.grpc_http1_bridge" filter) in the http filter // chain of a public listener is the authz filter to prevent unauthorized // access and that every filter chain uses our TLS certs. if opts.httpAuthzFilter != nil { cfg.HttpFilters = append([]*envoyhttp.HttpFilter{opts.httpAuthzFilter}, cfg.HttpFilters...) } if opts.protocol == "grpc" { // Add grpc bridge before router and authz 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, false) } func makeFilter(name string, cfg proto.Message, typed bool) (*envoylistener.Filter, error) { filter := &envoylistener.Filter{ Name: name, } if typed { any, err := pbtypes.MarshalAny(cfg) if err != nil { return nil, err } filter.ConfigType = &envoylistener.Filter_TypedConfig{TypedConfig: any} } else { // 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 } filter.ConfigType = &envoylistener.Filter_Config{Config: cfgStruct} } return filter, nil } func makeEnvoyHTTPFilter(name string, cfg proto.Message) (*envoyhttp.HttpFilter, 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 &envoyhttp.HttpFilter{ Name: name, ConfigType: &envoyhttp.HttpFilter_Config{Config: cfgStruct}, }, nil } func makeCommonTLSContextFromLeaf(cfgSnap *proxycfg.ConfigSnapshot, leaf *structs.IssuedCert) *envoyauth.CommonTlsContext { // Concatenate all the root PEMs into one. if cfgSnap.Roots == nil { return nil } // TODO(banks): verify this actually works with Envoy (docs are not clear). rootPEMS := "" 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 }