package agent import ( "fmt" "net/http" "net/http/httputil" "net/url" "path" "sort" "strings" "github.com/hashicorp/consul/acl" "github.com/hashicorp/consul/agent/config" "github.com/hashicorp/consul/agent/structs" "github.com/hashicorp/consul/api" "github.com/hashicorp/consul/logging" "github.com/hashicorp/go-hclog" ) // ServiceSummary is used to summarize a service type ServiceSummary struct { Kind structs.ServiceKind `json:",omitempty"` Name string Datacenter string Tags []string Nodes []string ExternalSources []string externalSourceSet map[string]struct{} // internal to track uniqueness checks map[string]*structs.HealthCheck InstanceCount int ChecksPassing int ChecksWarning int ChecksCritical int GatewayConfig GatewayConfig TransparentProxy bool transparentProxySet bool structs.EnterpriseMeta } func (s *ServiceSummary) LessThan(other *ServiceSummary) bool { if s.EnterpriseMeta.LessThan(&other.EnterpriseMeta) { return true } return s.Name < other.Name } type GatewayConfig struct { AssociatedServiceCount int `json:",omitempty"` Addresses []string `json:",omitempty"` // internal to track uniqueness addressesSet map[string]struct{} } type ServiceListingSummary struct { ServiceSummary ConnectedWithProxy bool ConnectedWithGateway bool } type ServiceTopologySummary struct { ServiceSummary Source string Intention structs.IntentionDecisionSummary } type ServiceTopology struct { Protocol string TransparentProxy bool Upstreams []*ServiceTopologySummary Downstreams []*ServiceTopologySummary FilteredByACLs bool } // UINodes is used to list the nodes in a given datacenter. We return a // NodeDump which provides overview information for all the nodes func (s *HTTPHandlers) UINodes(resp http.ResponseWriter, req *http.Request) (interface{}, error) { // Parse arguments args := structs.DCSpecificRequest{} if done := s.parse(resp, req, &args.Datacenter, &args.QueryOptions); done { return nil, nil } if err := s.parseEntMeta(req, &args.EnterpriseMeta); err != nil { return nil, err } s.parseFilter(req, &args.Filter) // Make the RPC request var out structs.IndexedNodeDump defer setMeta(resp, &out.QueryMeta) RPC: if err := s.agent.RPC("Internal.NodeDump", &args, &out); err != nil { // Retry the request allowing stale data if no leader if strings.Contains(err.Error(), structs.ErrNoLeader.Error()) && !args.AllowStale { args.AllowStale = true goto RPC } return nil, err } // Use empty list instead of nil for _, info := range out.Dump { if info.Services == nil { info.Services = make([]*structs.NodeService, 0) } if info.Checks == nil { info.Checks = make([]*structs.HealthCheck, 0) } } if out.Dump == nil { out.Dump = make(structs.NodeDump, 0) } return out.Dump, nil } // UINodeInfo is used to get info on a single node in a given datacenter. We return a // NodeInfo which provides overview information for the node func (s *HTTPHandlers) UINodeInfo(resp http.ResponseWriter, req *http.Request) (interface{}, error) { // Parse arguments args := structs.NodeSpecificRequest{} if done := s.parse(resp, req, &args.Datacenter, &args.QueryOptions); done { return nil, nil } if err := s.parseEntMeta(req, &args.EnterpriseMeta); err != nil { return nil, err } // Verify we have some DC, or use the default args.Node = strings.TrimPrefix(req.URL.Path, "/v1/internal/ui/node/") if args.Node == "" { resp.WriteHeader(http.StatusBadRequest) fmt.Fprint(resp, "Missing node name") return nil, nil } // Make the RPC request var out structs.IndexedNodeDump defer setMeta(resp, &out.QueryMeta) RPC: if err := s.agent.RPC("Internal.NodeInfo", &args, &out); err != nil { // Retry the request allowing stale data if no leader if strings.Contains(err.Error(), structs.ErrNoLeader.Error()) && !args.AllowStale { args.AllowStale = true goto RPC } return nil, err } // Return only the first entry if len(out.Dump) > 0 { info := out.Dump[0] if info.Services == nil { info.Services = make([]*structs.NodeService, 0) } if info.Checks == nil { info.Checks = make([]*structs.HealthCheck, 0) } return info, nil } resp.WriteHeader(http.StatusNotFound) return nil, nil } // UIServices is used to list the services in a given datacenter. We return a // ServiceSummary which provides overview information for the service func (s *HTTPHandlers) UIServices(resp http.ResponseWriter, req *http.Request) (interface{}, error) { // Parse arguments args := structs.ServiceDumpRequest{} if done := s.parse(resp, req, &args.Datacenter, &args.QueryOptions); done { return nil, nil } if err := s.parseEntMeta(req, &args.EnterpriseMeta); err != nil { return nil, err } s.parseFilter(req, &args.Filter) // Make the RPC request var out structs.IndexedNodesWithGateways defer setMeta(resp, &out.QueryMeta) RPC: if err := s.agent.RPC("Internal.ServiceDump", &args, &out); err != nil { // Retry the request allowing stale data if no leader if strings.Contains(err.Error(), structs.ErrNoLeader.Error()) && !args.AllowStale { args.AllowStale = true goto RPC } return nil, err } // Store the names of the gateways associated with each service var ( serviceGateways = make(map[structs.ServiceName][]structs.ServiceName) numLinkedServices = make(map[structs.ServiceName]int) ) for _, gs := range out.Gateways { serviceGateways[gs.Service] = append(serviceGateways[gs.Service], gs.Gateway) numLinkedServices[gs.Gateway] += 1 } summaries, hasProxy := summarizeServices(out.Nodes.ToServiceDump(), nil, "") sorted := prepSummaryOutput(summaries, false) // Ensure at least a zero length slice result := make([]*ServiceListingSummary, 0) for _, svc := range sorted { sum := ServiceListingSummary{ServiceSummary: *svc} sn := structs.NewServiceName(svc.Name, &svc.EnterpriseMeta) if hasProxy[sn] { sum.ConnectedWithProxy = true } // Verify that at least one of the gateways linked by config entry has an instance registered in the catalog for _, gw := range serviceGateways[sn] { if s := summaries[gw]; s != nil && sum.InstanceCount > 0 { sum.ConnectedWithGateway = true } } sum.GatewayConfig.AssociatedServiceCount = numLinkedServices[sn] result = append(result, &sum) } return result, nil } // UIGatewayServices is used to query all the nodes for services associated with a gateway along with their gateway config func (s *HTTPHandlers) UIGatewayServicesNodes(resp http.ResponseWriter, req *http.Request) (interface{}, error) { // Parse arguments args := structs.ServiceSpecificRequest{} if err := s.parseEntMetaNoWildcard(req, &args.EnterpriseMeta); err != nil { return nil, err } if done := s.parse(resp, req, &args.Datacenter, &args.QueryOptions); done { return nil, nil } // Pull out the service name args.ServiceName = strings.TrimPrefix(req.URL.Path, "/v1/internal/ui/gateway-services-nodes/") if args.ServiceName == "" { resp.WriteHeader(http.StatusBadRequest) fmt.Fprint(resp, "Missing gateway name") return nil, nil } // Make the RPC request var out structs.IndexedServiceDump defer setMeta(resp, &out.QueryMeta) RPC: if err := s.agent.RPC("Internal.GatewayServiceDump", &args, &out); err != nil { // Retry the request allowing stale data if no leader if strings.Contains(err.Error(), structs.ErrNoLeader.Error()) && !args.AllowStale { args.AllowStale = true goto RPC } return nil, err } summaries, _ := summarizeServices(out.Dump, s.agent.config, args.Datacenter) prepped := prepSummaryOutput(summaries, false) if prepped == nil { prepped = make([]*ServiceSummary, 0) } return prepped, nil } // UIServiceTopology returns the list of upstreams and downstreams for a Connect enabled service. // - Downstreams are services that list the given service as an upstream // - Upstreams are the upstreams defined in the given service's proxy registrations func (s *HTTPHandlers) UIServiceTopology(resp http.ResponseWriter, req *http.Request) (interface{}, error) { // Parse arguments args := structs.ServiceSpecificRequest{} if done := s.parse(resp, req, &args.Datacenter, &args.QueryOptions); done { return nil, nil } if err := s.parseEntMeta(req, &args.EnterpriseMeta); err != nil { return nil, err } args.ServiceName = strings.TrimPrefix(req.URL.Path, "/v1/internal/ui/service-topology/") if args.ServiceName == "" { resp.WriteHeader(http.StatusBadRequest) fmt.Fprint(resp, "Missing service name") return nil, nil } kind, ok := req.URL.Query()["kind"] if !ok { resp.WriteHeader(http.StatusBadRequest) fmt.Fprint(resp, "Missing service kind") return nil, nil } args.ServiceKind = structs.ServiceKind(kind[0]) switch args.ServiceKind { case structs.ServiceKindTypical, structs.ServiceKindIngressGateway: // allowed default: resp.WriteHeader(http.StatusBadRequest) fmt.Fprintf(resp, "Unsupported service kind %q", args.ServiceKind) return nil, nil } // Make the RPC request var out structs.IndexedServiceTopology defer setMeta(resp, &out.QueryMeta) RPC: if err := s.agent.RPC("Internal.ServiceTopology", &args, &out); err != nil { // Retry the request allowing stale data if no leader if strings.Contains(err.Error(), structs.ErrNoLeader.Error()) && !args.AllowStale { args.AllowStale = true goto RPC } return nil, err } upstreams, _ := summarizeServices(out.ServiceTopology.Upstreams.ToServiceDump(), nil, "") downstreams, _ := summarizeServices(out.ServiceTopology.Downstreams.ToServiceDump(), nil, "") var ( upstreamResp = make([]*ServiceTopologySummary, 0) downstreamResp = make([]*ServiceTopologySummary, 0) ) // Sort and attach intention data for upstreams and downstreams sortedUpstreams := prepSummaryOutput(upstreams, true) for _, svc := range sortedUpstreams { sn := structs.NewServiceName(svc.Name, &svc.EnterpriseMeta) sum := ServiceTopologySummary{ ServiceSummary: *svc, Intention: out.ServiceTopology.UpstreamDecisions[sn.String()], Source: out.ServiceTopology.UpstreamSources[sn.String()], } upstreamResp = append(upstreamResp, &sum) } sortedDownstreams := prepSummaryOutput(downstreams, true) for _, svc := range sortedDownstreams { sn := structs.NewServiceName(svc.Name, &svc.EnterpriseMeta) sum := ServiceTopologySummary{ ServiceSummary: *svc, Intention: out.ServiceTopology.DownstreamDecisions[sn.String()], Source: out.ServiceTopology.DownstreamSources[sn.String()], } downstreamResp = append(downstreamResp, &sum) } topo := ServiceTopology{ TransparentProxy: out.ServiceTopology.TransparentProxy, Protocol: out.ServiceTopology.MetricsProtocol, Upstreams: upstreamResp, Downstreams: downstreamResp, FilteredByACLs: out.FilteredByACLs, } return topo, nil } func summarizeServices(dump structs.ServiceDump, cfg *config.RuntimeConfig, dc string) (map[structs.ServiceName]*ServiceSummary, map[structs.ServiceName]bool) { var ( summary = make(map[structs.ServiceName]*ServiceSummary) hasProxy = make(map[structs.ServiceName]bool) ) getService := func(service structs.ServiceName) *ServiceSummary { serv, ok := summary[service] if !ok { serv = &ServiceSummary{ Name: service.Name, EnterpriseMeta: service.EnterpriseMeta, // the other code will increment this unconditionally so we // shouldn't initialize it to 1 InstanceCount: 0, } summary[service] = serv } return serv } for _, csn := range dump { if cfg != nil && csn.GatewayService != nil { gwsvc := csn.GatewayService sum := getService(gwsvc.Service) modifySummaryForGatewayService(cfg, dc, sum, gwsvc) } // Will happen in cases where we only have the GatewayServices mapping if csn.Service == nil { continue } sn := structs.NewServiceName(csn.Service.Service, &csn.Service.EnterpriseMeta) sum := getService(sn) svc := csn.Service sum.Nodes = append(sum.Nodes, csn.Node.Node) sum.Kind = svc.Kind sum.Datacenter = csn.Node.Datacenter sum.InstanceCount += 1 if svc.Kind == structs.ServiceKindConnectProxy { sn := structs.NewServiceName(svc.Proxy.DestinationServiceName, &svc.EnterpriseMeta) hasProxy[sn] = true destination := getService(sn) for _, check := range csn.Checks { cid := structs.NewCheckID(check.CheckID, &check.EnterpriseMeta) uid := structs.UniqueID(csn.Node.Node, cid.String()) if destination.checks == nil { destination.checks = make(map[string]*structs.HealthCheck) } destination.checks[uid] = check } // Only consider the target service to be transparent when all its proxy instances are in that mode. // This is done because the flag is used to display warnings about proxies needing to enable // transparent proxy mode. If ANY instance isn't in the right mode then the warming applies. if svc.Proxy.Mode == structs.ProxyModeTransparent && !destination.transparentProxySet { destination.TransparentProxy = true } if svc.Proxy.Mode != structs.ProxyModeTransparent { destination.TransparentProxy = false } destination.transparentProxySet = true } for _, tag := range svc.Tags { found := false for _, existing := range sum.Tags { if existing == tag { found = true break } } if !found { sum.Tags = append(sum.Tags, tag) } } // If there is an external source, add it to the list of external // sources. We only want to add unique sources so there is extra // accounting here with an unexported field to maintain the set // of sources. if len(svc.Meta) > 0 && svc.Meta[structs.MetaExternalSource] != "" { source := svc.Meta[structs.MetaExternalSource] if sum.externalSourceSet == nil { sum.externalSourceSet = make(map[string]struct{}) } if _, ok := sum.externalSourceSet[source]; !ok { sum.externalSourceSet[source] = struct{}{} sum.ExternalSources = append(sum.ExternalSources, source) } } for _, check := range csn.Checks { cid := structs.NewCheckID(check.CheckID, &check.EnterpriseMeta) uid := structs.UniqueID(csn.Node.Node, cid.String()) if sum.checks == nil { sum.checks = make(map[string]*structs.HealthCheck) } sum.checks[uid] = check } } return summary, hasProxy } func prepSummaryOutput(summaries map[structs.ServiceName]*ServiceSummary, excludeSidecars bool) []*ServiceSummary { var resp []*ServiceSummary // Ensure at least a zero length slice resp = make([]*ServiceSummary, 0) // Collect and sort resp for display for _, sum := range summaries { sort.Strings(sum.Nodes) sort.Strings(sum.Tags) for _, chk := range sum.checks { switch chk.Status { case api.HealthPassing: sum.ChecksPassing++ case api.HealthWarning: sum.ChecksWarning++ case api.HealthCritical: sum.ChecksCritical++ } } if excludeSidecars && sum.Kind != structs.ServiceKindTypical && sum.Kind != structs.ServiceKindIngressGateway { continue } resp = append(resp, sum) } sort.Slice(resp, func(i, j int) bool { return resp[i].LessThan(resp[j]) }) return resp } func modifySummaryForGatewayService( cfg *config.RuntimeConfig, datacenter string, sum *ServiceSummary, gwsvc *structs.GatewayService, ) { var dnsAddresses []string for _, domain := range []string{cfg.DNSDomain, cfg.DNSAltDomain} { // If the domain is empty, do not use it to construct a valid DNS // address if domain == "" { continue } dnsAddresses = append(dnsAddresses, serviceIngressDNSName( gwsvc.Service.Name, datacenter, domain, &gwsvc.Service.EnterpriseMeta, )) } for _, addr := range gwsvc.Addresses(dnsAddresses) { // check for duplicates, a service will have a ServiceInfo struct for // every instance that is registered. if _, ok := sum.GatewayConfig.addressesSet[addr]; !ok { if sum.GatewayConfig.addressesSet == nil { sum.GatewayConfig.addressesSet = make(map[string]struct{}) } sum.GatewayConfig.addressesSet[addr] = struct{}{} sum.GatewayConfig.Addresses = append( sum.GatewayConfig.Addresses, addr, ) } } } // GET /v1/internal/ui/gateway-intentions/:gateway func (s *HTTPHandlers) UIGatewayIntentions(resp http.ResponseWriter, req *http.Request) (interface{}, error) { var args structs.IntentionQueryRequest if done := s.parse(resp, req, &args.Datacenter, &args.QueryOptions); done { return nil, nil } var entMeta structs.EnterpriseMeta if err := s.parseEntMetaNoWildcard(req, &entMeta); err != nil { return nil, err } // Pull out the service name name := strings.TrimPrefix(req.URL.Path, "/v1/internal/ui/gateway-intentions/") if name == "" { resp.WriteHeader(http.StatusBadRequest) fmt.Fprint(resp, "Missing gateway name") return nil, nil } args.Match = &structs.IntentionQueryMatch{ Type: structs.IntentionMatchDestination, Entries: []structs.IntentionMatchEntry{ { Namespace: entMeta.NamespaceOrEmpty(), Name: name, }, }, } var reply structs.IndexedIntentions defer setMeta(resp, &reply.QueryMeta) if err := s.agent.RPC("Internal.GatewayIntentions", args, &reply); err != nil { return nil, err } return reply.Intentions, nil } // UIMetricsProxy handles the /v1/internal/ui/metrics-proxy/ endpoint which, if // configured, provides a simple read-only HTTP proxy to a single metrics // backend to expose it to the UI. func (s *HTTPHandlers) UIMetricsProxy(resp http.ResponseWriter, req *http.Request) (interface{}, error) { // Check the UI was enabled at agent startup (note this is not reloadable // currently). if !s.IsUIEnabled() { return nil, NotFoundError{Reason: "UI is not enabled"} } // Load reloadable proxy config cfg, ok := s.metricsProxyCfg.Load().(config.UIMetricsProxy) if !ok || cfg.BaseURL == "" { // Proxy not configured return nil, NotFoundError{Reason: "Metrics proxy is not enabled"} } // Fetch the ACL token, if provided, but ONLY from headers since other // metrics proxies might use a ?token query string parameter for something. var token string s.parseTokenFromHeaders(req, &token) // Clear the token from the headers so we don't end up proxying it. s.clearTokenFromHeaders(req) var entMeta structs.EnterpriseMeta authz, err := s.agent.delegate.ResolveTokenAndDefaultMeta(token, &entMeta, nil) if err != nil { return nil, err } if authz != nil { // This endpoint requires wildcard read on all services and all nodes. // // In enterprise it requires this _in all namespaces_ too. wildMeta := structs.WildcardEnterpriseMeta() var authzContext acl.AuthorizerContext wildMeta.FillAuthzContext(&authzContext) if authz.NodeReadAll(&authzContext) != acl.Allow || authz.ServiceReadAll(&authzContext) != acl.Allow { return nil, acl.ErrPermissionDenied } } log := s.agent.logger.Named(logging.UIMetricsProxy) // Construct the new URL from the path and the base path. Note we do this here // not in the Director function below because we can handle any errors cleanly // here. // Replace prefix in the path subPath := strings.TrimPrefix(req.URL.Path, "/v1/internal/ui/metrics-proxy") // Append that to the BaseURL (which might contain a path prefix component) newURL := cfg.BaseURL + subPath // Parse it into a new URL u, err := url.Parse(newURL) if err != nil { log.Error("couldn't parse target URL", "base_url", cfg.BaseURL, "path", subPath) return nil, BadRequestError{Reason: "Invalid path."} } // Clean the new URL path to prevent path traversal attacks and remove any // double slashes etc. u.Path = path.Clean(u.Path) if len(cfg.PathAllowlist) > 0 { // This could be done better with a map, but for the prometheus default // integration this list has two items in it, so the straight iteration // isn't awful. denied := true for _, allowedPath := range cfg.PathAllowlist { if u.Path == allowedPath { denied = false break } } if denied { log.Error("target URL path is not allowed", "base_url", cfg.BaseURL, "path", subPath, "target_url", u.String(), "path_allowlist", cfg.PathAllowlist, ) resp.WriteHeader(http.StatusForbidden) return nil, nil } } // Pass through query params u.RawQuery = req.URL.RawQuery // Validate that the full BaseURL is still a prefix - if there was a path // prefix on the BaseURL but an attacker tried to circumvent it with path // traversal then the Clean above would have resolve the /../ components back // to the actual path which means part of the prefix will now be missing. // // Note that in practice this is not currently possible since any /../ in the // path would have already been resolved by the API server mux and so not even // hit this handler. Any /../ that are far enough into the path to hit this // handler, can't backtrack far enough to eat into the BaseURL either. But we // leave this in anyway in case something changes in the future. if !strings.HasPrefix(u.String(), cfg.BaseURL) { log.Error("target URL escaped from base path", "base_url", cfg.BaseURL, "path", subPath, "target_url", u.String(), ) return nil, BadRequestError{Reason: "Invalid path."} } // Add any configured headers for _, h := range cfg.AddHeaders { req.Header.Set(h.Name, h.Value) } log.Debug("proxying request", "to", u.String()) proxy := httputil.ReverseProxy{ Director: func(r *http.Request) { r.URL = u }, ErrorLog: log.StandardLogger(&hclog.StandardLoggerOptions{ InferLevels: true, }), } proxy.ServeHTTP(resp, req) return nil, nil }