package agent import ( "encoding/json" "errors" "fmt" "log" "net" "net/http" "path/filepath" "strconv" "strings" "time" "github.com/mitchellh/mapstructure" "github.com/hashicorp/go-memdb" "github.com/mitchellh/hashstructure" "github.com/hashicorp/consul/acl" cachetype "github.com/hashicorp/consul/agent/cache-types" "github.com/hashicorp/consul/agent/debug" "github.com/hashicorp/consul/agent/local" "github.com/hashicorp/consul/agent/structs" token_store "github.com/hashicorp/consul/agent/token" "github.com/hashicorp/consul/api" "github.com/hashicorp/consul/ipaddr" "github.com/hashicorp/consul/lib" "github.com/hashicorp/consul/lib/file" "github.com/hashicorp/consul/logger" "github.com/hashicorp/consul/types" bexpr "github.com/hashicorp/go-bexpr" "github.com/hashicorp/logutils" "github.com/hashicorp/serf/coordinate" "github.com/hashicorp/serf/serf" "github.com/prometheus/client_golang/prometheus" "github.com/prometheus/client_golang/prometheus/promhttp" ) type Self struct { Config interface{} DebugConfig map[string]interface{} Coord *coordinate.Coordinate Member serf.Member Stats map[string]map[string]string Meta map[string]string } func (s *HTTPServer) AgentSelf(resp http.ResponseWriter, req *http.Request) (interface{}, error) { // Fetch the ACL token, if any, and enforce agent policy. var token string s.parseToken(req, &token) rule, err := s.agent.resolveToken(token) if err != nil { return nil, err } if rule != nil && !rule.AgentRead(s.agent.config.NodeName) { return nil, acl.ErrPermissionDenied } var cs lib.CoordinateSet if !s.agent.config.DisableCoordinates { var err error if cs, err = s.agent.GetLANCoordinate(); err != nil { return nil, err } } config := struct { Datacenter string NodeName string NodeID string Revision string Server bool Version string }{ Datacenter: s.agent.config.Datacenter, NodeName: s.agent.config.NodeName, NodeID: string(s.agent.config.NodeID), Revision: s.agent.config.Revision, Server: s.agent.config.ServerMode, Version: s.agent.config.Version, } return Self{ Config: config, DebugConfig: s.agent.config.Sanitized(), Coord: cs[s.agent.config.SegmentName], Member: s.agent.LocalMember(), Stats: s.agent.Stats(), Meta: s.agent.State.Metadata(), }, nil } // enablePrometheusOutput will look for Prometheus mime-type or format Query parameter the same way as Nomad func enablePrometheusOutput(req *http.Request) bool { if format := req.URL.Query().Get("format"); format == "prometheus" { return true } return false } func (s *HTTPServer) AgentMetrics(resp http.ResponseWriter, req *http.Request) (interface{}, error) { // Fetch the ACL token, if any, and enforce agent policy. var token string s.parseToken(req, &token) rule, err := s.agent.resolveToken(token) if err != nil { return nil, err } if rule != nil && !rule.AgentRead(s.agent.config.NodeName) { return nil, acl.ErrPermissionDenied } if enablePrometheusOutput(req) { if s.agent.config.Telemetry.PrometheusRetentionTime < 1 { resp.WriteHeader(http.StatusUnsupportedMediaType) fmt.Fprint(resp, "Prometheus is not enabled since its retention time is not positive") return nil, nil } handlerOptions := promhttp.HandlerOpts{ ErrorLog: s.agent.logger, ErrorHandling: promhttp.ContinueOnError, } handler := promhttp.HandlerFor(prometheus.DefaultGatherer, handlerOptions) handler.ServeHTTP(resp, req) return nil, nil } return s.agent.MemSink.DisplayMetrics(resp, req) } func (s *HTTPServer) AgentReload(resp http.ResponseWriter, req *http.Request) (interface{}, error) { // Fetch the ACL token, if any, and enforce agent policy. var token string s.parseToken(req, &token) rule, err := s.agent.resolveToken(token) if err != nil { return nil, err } if rule != nil && !rule.AgentWrite(s.agent.config.NodeName) { return nil, acl.ErrPermissionDenied } // Trigger the reload errCh := make(chan error) select { case <-s.agent.shutdownCh: return nil, fmt.Errorf("Agent was shutdown before reload could be completed") case s.agent.reloadCh <- errCh: } // Wait for the result of the reload, or for the agent to shutdown select { case <-s.agent.shutdownCh: return nil, fmt.Errorf("Agent was shutdown before reload could be completed") case err := <-errCh: return nil, err } } func buildAgentService(s *structs.NodeService, proxies map[string]*local.ManagedProxy) api.AgentService { weights := api.AgentWeights{Passing: 1, Warning: 1} if s.Weights != nil { if s.Weights.Passing > 0 { weights.Passing = s.Weights.Passing } weights.Warning = s.Weights.Warning } as := api.AgentService{ Kind: api.ServiceKind(s.Kind), ID: s.ID, Service: s.Service, Tags: s.Tags, Meta: s.Meta, Port: s.Port, Address: s.Address, EnableTagOverride: s.EnableTagOverride, CreateIndex: s.CreateIndex, ModifyIndex: s.ModifyIndex, Weights: weights, } if as.Tags == nil { as.Tags = []string{} } if as.Meta == nil { as.Meta = map[string]string{} } // Attach Unmanaged Proxy config if exists if s.Kind == structs.ServiceKindConnectProxy { as.Proxy = s.Proxy.ToAPI() // DEPRECATED (ProxyDestination) - remove this when removing ProxyDestination // Also set the deprecated ProxyDestination as.ProxyDestination = as.Proxy.DestinationServiceName } // Attach Connect configs if they exist. We use the actual proxy state since // that may have had defaults filled in compared to the config that was // provided with the service as stored in the NodeService here. if proxy, ok := proxies[s.ID+"-proxy"]; ok { as.Connect = &api.AgentServiceConnect{ Proxy: &api.AgentServiceConnectProxy{ ExecMode: api.ProxyExecMode(proxy.Proxy.ExecMode.String()), Command: proxy.Proxy.Command, Config: proxy.Proxy.Config, Upstreams: proxy.Proxy.Upstreams.ToAPI(), }, } } else if s.Connect.Native { as.Connect = &api.AgentServiceConnect{ Native: true, } } return as } func (s *HTTPServer) AgentServices(resp http.ResponseWriter, req *http.Request) (interface{}, error) { // Fetch the ACL token, if any. var token string s.parseToken(req, &token) var filterExpression string s.parseFilter(req, &filterExpression) services := s.agent.State.Services() if err := s.agent.filterServices(token, &services); err != nil { return nil, err } proxies := s.agent.State.Proxies() // Convert into api.AgentService since that includes Connect config but so far // NodeService doesn't need to internally. They are otherwise identical since // that is the struct used in client for reading the one we output here // anyway. agentSvcs := make(map[string]*api.AgentService) // Use empty list instead of nil for id, s := range services { agentService := buildAgentService(s, proxies) agentSvcs[id] = &agentService } filter, err := bexpr.CreateFilter(filterExpression, nil, agentSvcs) if err != nil { return nil, err } return filter.Execute(agentSvcs) } // GET /v1/agent/service/:service_id // // Returns the service definition for a single local services and allows // blocking watch using hash-based blocking. func (s *HTTPServer) AgentService(resp http.ResponseWriter, req *http.Request) (interface{}, error) { // Get the proxy ID. Note that this is the ID of a proxy's service instance. id := strings.TrimPrefix(req.URL.Path, "/v1/agent/service/") // DEPRECATED(managed-proxies) - remove this whole hack. // // Support managed proxies until they are removed entirely. Since built-in // proxy will now use this endpoint, in order to not break managed proxies in // the interim until they are removed, we need to mirror the default-setting // behavior they had. Rather than thread that through this whole method as // special cases that need to be unwound later (and duplicate logic in the // proxy config endpoint) just defer to that and then translate the response. if managedProxy := s.agent.State.Proxy(id); managedProxy != nil { // This is for a managed proxy, use the old endpoint's behavior req.URL.Path = "/v1/agent/connect/proxy/" + id obj, err := s.AgentConnectProxyConfig(resp, req) if err != nil { return obj, err } proxyCfg, ok := obj.(*api.ConnectProxyConfig) if !ok { return nil, errors.New("internal error") } // These are all set by defaults so type checks are just sanity checks that // should never fail. port, ok := proxyCfg.Config["bind_port"].(int) if !ok || port < 1 { return nil, errors.New("invalid proxy config") } addr, ok := proxyCfg.Config["bind_address"].(string) if !ok || addr == "" { return nil, errors.New("invalid proxy config") } localAddr, ok := proxyCfg.Config["local_service_address"].(string) if !ok || localAddr == "" { return nil, errors.New("invalid proxy config") } // Old local_service_address was a host:port localAddress, localPortRaw, err := net.SplitHostPort(localAddr) if err != nil { return nil, err } localPort, err := strconv.Atoi(localPortRaw) if err != nil { return nil, err } reply := &api.AgentService{ Kind: api.ServiceKindConnectProxy, ID: proxyCfg.ProxyServiceID, Service: managedProxy.Proxy.ProxyService.Service, Port: port, Address: addr, ContentHash: proxyCfg.ContentHash, Proxy: &api.AgentServiceConnectProxyConfig{ DestinationServiceName: proxyCfg.TargetServiceName, DestinationServiceID: proxyCfg.TargetServiceID, LocalServiceAddress: localAddress, LocalServicePort: localPort, Config: proxyCfg.Config, Upstreams: proxyCfg.Upstreams, }, } return reply, nil } // Maybe block var queryOpts structs.QueryOptions if parseWait(resp, req, &queryOpts) { // parseWait returns an error itself return nil, nil } // Parse the token var token string s.parseToken(req, &token) // Parse hash specially. Eventually this should happen in parseWait and end up // in QueryOptions but I didn't want to make very general changes right away. hash := req.URL.Query().Get("hash") return s.agentLocalBlockingQuery(resp, hash, &queryOpts, func(ws memdb.WatchSet) (string, interface{}, error) { svcState := s.agent.State.ServiceState(id) if svcState == nil { resp.WriteHeader(http.StatusNotFound) fmt.Fprintf(resp, "unknown proxy service ID: %s", id) return "", nil, nil } svc := svcState.Service // Setup watch on the service ws.Add(svcState.WatchCh) // Check ACLs. rule, err := s.agent.resolveToken(token) if err != nil { return "", nil, err } if rule != nil && !rule.ServiceRead(svc.Service) { return "", nil, acl.ErrPermissionDenied } var connect *api.AgentServiceConnect var proxy *api.AgentServiceConnectProxyConfig if svc.Connect.Native { connect = &api.AgentServiceConnect{ Native: svc.Connect.Native, } } if svc.Kind == structs.ServiceKindConnectProxy { proxy = svc.Proxy.ToAPI() } var weights api.AgentWeights if svc.Weights != nil { err := mapstructure.Decode(svc.Weights, &weights) if err != nil { return "", nil, err } } // Calculate the content hash over the response, minus the hash field reply := &api.AgentService{ Kind: api.ServiceKind(svc.Kind), ID: svc.ID, Service: svc.Service, Tags: svc.Tags, Meta: svc.Meta, Port: svc.Port, Address: svc.Address, EnableTagOverride: svc.EnableTagOverride, Weights: weights, Proxy: proxy, Connect: connect, } rawHash, err := hashstructure.Hash(reply, nil) if err != nil { return "", nil, err } // Include the ContentHash in the response body reply.ContentHash = fmt.Sprintf("%x", rawHash) return reply.ContentHash, reply, nil }) } func (s *HTTPServer) AgentChecks(resp http.ResponseWriter, req *http.Request) (interface{}, error) { // Fetch the ACL token, if any. var token string s.parseToken(req, &token) var filterExpression string s.parseFilter(req, &filterExpression) filter, err := bexpr.CreateFilter(filterExpression, nil, nil) if err != nil { return nil, err } checks := s.agent.State.Checks() if err := s.agent.filterChecks(token, &checks); err != nil { return nil, err } // Use empty list instead of nil for id, c := range checks { if c.ServiceTags == nil { clone := *c clone.ServiceTags = make([]string, 0) checks[id] = &clone } } return filter.Execute(checks) } func (s *HTTPServer) AgentMembers(resp http.ResponseWriter, req *http.Request) (interface{}, error) { // Fetch the ACL token, if any. var token string s.parseToken(req, &token) // Check if the WAN is being queried wan := false if other := req.URL.Query().Get("wan"); other != "" { wan = true } segment := req.URL.Query().Get("segment") if wan { switch segment { case "", api.AllSegments: // The zero value and the special "give me all members" // key are ok, otherwise the argument doesn't apply to // the WAN. default: resp.WriteHeader(http.StatusBadRequest) fmt.Fprint(resp, "Cannot provide a segment with wan=true") return nil, nil } } var members []serf.Member if wan { members = s.agent.WANMembers() } else { var err error if segment == api.AllSegments { members, err = s.agent.delegate.LANMembersAllSegments() } else { members, err = s.agent.delegate.LANSegmentMembers(segment) } if err != nil { return nil, err } } if err := s.agent.filterMembers(token, &members); err != nil { return nil, err } return members, nil } func (s *HTTPServer) AgentJoin(resp http.ResponseWriter, req *http.Request) (interface{}, error) { // Fetch the ACL token, if any, and enforce agent policy. var token string s.parseToken(req, &token) rule, err := s.agent.resolveToken(token) if err != nil { return nil, err } if rule != nil && !rule.AgentWrite(s.agent.config.NodeName) { return nil, acl.ErrPermissionDenied } // Check if the WAN is being queried wan := false if other := req.URL.Query().Get("wan"); other != "" { wan = true } // Get the address addr := strings.TrimPrefix(req.URL.Path, "/v1/agent/join/") if wan { _, err = s.agent.JoinWAN([]string{addr}) } else { _, err = s.agent.JoinLAN([]string{addr}) } return nil, err } func (s *HTTPServer) AgentLeave(resp http.ResponseWriter, req *http.Request) (interface{}, error) { // Fetch the ACL token, if any, and enforce agent policy. var token string s.parseToken(req, &token) rule, err := s.agent.resolveToken(token) if err != nil { return nil, err } if rule != nil && !rule.AgentWrite(s.agent.config.NodeName) { return nil, acl.ErrPermissionDenied } if err := s.agent.Leave(); err != nil { return nil, err } return nil, s.agent.ShutdownAgent() } func (s *HTTPServer) AgentForceLeave(resp http.ResponseWriter, req *http.Request) (interface{}, error) { // Fetch the ACL token, if any, and enforce agent policy. var token string s.parseToken(req, &token) rule, err := s.agent.resolveToken(token) if err != nil { return nil, err } if rule != nil && !rule.AgentWrite(s.agent.config.NodeName) { return nil, acl.ErrPermissionDenied } addr := strings.TrimPrefix(req.URL.Path, "/v1/agent/force-leave/") return nil, s.agent.ForceLeave(addr) } // syncChanges is a helper function which wraps a blocking call to sync // services and checks to the server. If the operation fails, we only // only warn because the write did succeed and anti-entropy will sync later. func (s *HTTPServer) syncChanges() { if err := s.agent.State.SyncChanges(); err != nil { s.agent.logger.Printf("[ERR] agent: failed to sync changes: %v", err) } } func (s *HTTPServer) AgentRegisterCheck(resp http.ResponseWriter, req *http.Request) (interface{}, error) { var args structs.CheckDefinition // Fixup the type decode of TTL or Interval. decodeCB := func(raw interface{}) error { return FixupCheckType(raw) } if err := decodeBody(req, &args, decodeCB); err != nil { resp.WriteHeader(http.StatusBadRequest) fmt.Fprintf(resp, "Request decode failed: %v", err) return nil, nil } // Verify the check has a name. if args.Name == "" { resp.WriteHeader(http.StatusBadRequest) fmt.Fprint(resp, "Missing check name") return nil, nil } if args.Status != "" && !structs.ValidStatus(args.Status) { resp.WriteHeader(http.StatusBadRequest) fmt.Fprint(resp, "Bad check status") return nil, nil } // Construct the health check. health := args.HealthCheck(s.agent.config.NodeName) // Verify the check type. chkType := args.CheckType() err := chkType.Validate() if err != nil { resp.WriteHeader(http.StatusBadRequest) fmt.Fprint(resp, fmt.Errorf("Invalid check: %v", err)) return nil, nil } if health.ServiceID != "" { // fixup the service name so that vetCheckRegister requires the right ACLs service := s.agent.State.Service(health.ServiceID) if service != nil { health.ServiceName = service.Service } } // Get the provided token, if any, and vet against any ACL policies. var token string s.parseToken(req, &token) if err := s.agent.vetCheckRegister(token, health); err != nil { return nil, err } // Add the check. if err := s.agent.AddCheck(health, chkType, true, token, ConfigSourceRemote); err != nil { return nil, err } s.syncChanges() return nil, nil } func (s *HTTPServer) AgentDeregisterCheck(resp http.ResponseWriter, req *http.Request) (interface{}, error) { checkID := types.CheckID(strings.TrimPrefix(req.URL.Path, "/v1/agent/check/deregister/")) // Get the provided token, if any, and vet against any ACL policies. var token string s.parseToken(req, &token) if err := s.agent.vetCheckUpdate(token, checkID); err != nil { return nil, err } if err := s.agent.RemoveCheck(checkID, true); err != nil { return nil, err } s.syncChanges() return nil, nil } func (s *HTTPServer) AgentCheckPass(resp http.ResponseWriter, req *http.Request) (interface{}, error) { checkID := types.CheckID(strings.TrimPrefix(req.URL.Path, "/v1/agent/check/pass/")) note := req.URL.Query().Get("note") // Get the provided token, if any, and vet against any ACL policies. var token string s.parseToken(req, &token) if err := s.agent.vetCheckUpdate(token, checkID); err != nil { return nil, err } if err := s.agent.updateTTLCheck(checkID, api.HealthPassing, note); err != nil { return nil, err } s.syncChanges() return nil, nil } func (s *HTTPServer) AgentCheckWarn(resp http.ResponseWriter, req *http.Request) (interface{}, error) { checkID := types.CheckID(strings.TrimPrefix(req.URL.Path, "/v1/agent/check/warn/")) note := req.URL.Query().Get("note") // Get the provided token, if any, and vet against any ACL policies. var token string s.parseToken(req, &token) if err := s.agent.vetCheckUpdate(token, checkID); err != nil { return nil, err } if err := s.agent.updateTTLCheck(checkID, api.HealthWarning, note); err != nil { return nil, err } s.syncChanges() return nil, nil } func (s *HTTPServer) AgentCheckFail(resp http.ResponseWriter, req *http.Request) (interface{}, error) { checkID := types.CheckID(strings.TrimPrefix(req.URL.Path, "/v1/agent/check/fail/")) note := req.URL.Query().Get("note") // Get the provided token, if any, and vet against any ACL policies. var token string s.parseToken(req, &token) if err := s.agent.vetCheckUpdate(token, checkID); err != nil { return nil, err } if err := s.agent.updateTTLCheck(checkID, api.HealthCritical, note); err != nil { return nil, err } s.syncChanges() return nil, nil } // checkUpdate is the payload for a PUT to AgentCheckUpdate. type checkUpdate struct { // Status us one of the api.Health* states, "passing", "warning", or // "critical". Status string // Output is the information to post to the UI for operators as the // output of the process that decided to hit the TTL check. This is // different from the note field that's associated with the check // itself. Output string } // AgentCheckUpdate is a PUT-based alternative to the GET-based Pass/Warn/Fail // APIs. func (s *HTTPServer) AgentCheckUpdate(resp http.ResponseWriter, req *http.Request) (interface{}, error) { var update checkUpdate if err := decodeBody(req, &update, nil); err != nil { resp.WriteHeader(http.StatusBadRequest) fmt.Fprintf(resp, "Request decode failed: %v", err) return nil, nil } switch update.Status { case api.HealthPassing: case api.HealthWarning: case api.HealthCritical: default: resp.WriteHeader(http.StatusBadRequest) fmt.Fprintf(resp, "Invalid check status: '%s'", update.Status) return nil, nil } checkID := types.CheckID(strings.TrimPrefix(req.URL.Path, "/v1/agent/check/update/")) // Get the provided token, if any, and vet against any ACL policies. var token string s.parseToken(req, &token) if err := s.agent.vetCheckUpdate(token, checkID); err != nil { return nil, err } if err := s.agent.updateTTLCheck(checkID, update.Status, update.Output); err != nil { return nil, err } s.syncChanges() return nil, nil } // agentHealthService Returns Health for a given service ID func agentHealthService(serviceID string, s *HTTPServer) (int, string, api.HealthChecks) { checks := s.agent.State.Checks() serviceChecks := make(api.HealthChecks, 0) for _, c := range checks { if c.ServiceID == serviceID || c.ServiceID == "" { // TODO: harmonize struct.HealthCheck and api.HealthCheck (or at least extract conversion function) healthCheck := &api.HealthCheck{ Node: c.Node, CheckID: string(c.CheckID), Name: c.Name, Status: c.Status, Notes: c.Notes, Output: c.Output, ServiceID: c.ServiceID, ServiceName: c.ServiceName, ServiceTags: c.ServiceTags, } serviceChecks = append(serviceChecks, healthCheck) } } status := serviceChecks.AggregatedStatus() switch status { case api.HealthWarning: return http.StatusTooManyRequests, status, serviceChecks case api.HealthPassing: return http.StatusOK, status, serviceChecks default: return http.StatusServiceUnavailable, status, serviceChecks } } func returnTextPlain(req *http.Request) bool { if contentType := req.Header.Get("Accept"); strings.HasPrefix(contentType, "text/plain") { return true } if format := req.URL.Query().Get("format"); format != "" { return format == "text" } return false } // AgentHealthServiceByID return the local Service Health given its ID func (s *HTTPServer) AgentHealthServiceByID(resp http.ResponseWriter, req *http.Request) (interface{}, error) { // Pull out the service id (service id since there may be several instance of the same service on this host) serviceID := strings.TrimPrefix(req.URL.Path, "/v1/agent/health/service/id/") if serviceID == "" { return nil, &BadRequestError{Reason: "Missing serviceID"} } services := s.agent.State.Services() proxies := s.agent.State.Proxies() for _, service := range services { if service.ID == serviceID { code, status, healthChecks := agentHealthService(serviceID, s) if returnTextPlain(req) { return status, CodeWithPayloadError{StatusCode: code, Reason: status, ContentType: "text/plain"} } serviceInfo := buildAgentService(service, proxies) result := &api.AgentServiceChecksInfo{ AggregatedStatus: status, Checks: healthChecks, Service: &serviceInfo, } return result, CodeWithPayloadError{StatusCode: code, Reason: status, ContentType: "application/json"} } } notFoundReason := fmt.Sprintf("ServiceId %s not found", serviceID) if returnTextPlain(req) { return notFoundReason, CodeWithPayloadError{StatusCode: http.StatusNotFound, Reason: fmt.Sprintf("ServiceId %s not found", serviceID), ContentType: "application/json"} } return &api.AgentServiceChecksInfo{ AggregatedStatus: api.HealthCritical, Checks: nil, Service: nil, }, CodeWithPayloadError{StatusCode: http.StatusNotFound, Reason: notFoundReason, ContentType: "application/json"} } // AgentHealthServiceByName return the worse status of all the services with given name on an agent func (s *HTTPServer) AgentHealthServiceByName(resp http.ResponseWriter, req *http.Request) (interface{}, error) { // Pull out the service name serviceName := strings.TrimPrefix(req.URL.Path, "/v1/agent/health/service/name/") if serviceName == "" { return nil, &BadRequestError{Reason: "Missing service Name"} } code := http.StatusNotFound status := fmt.Sprintf("ServiceName %s Not Found", serviceName) services := s.agent.State.Services() result := make([]api.AgentServiceChecksInfo, 0, 16) proxies := s.agent.State.Proxies() for _, service := range services { if service.Service == serviceName { scode, sstatus, healthChecks := agentHealthService(service.ID, s) serviceInfo := buildAgentService(service, proxies) res := api.AgentServiceChecksInfo{ AggregatedStatus: sstatus, Checks: healthChecks, Service: &serviceInfo, } result = append(result, res) // When service is not found, we ignore it and keep existing HTTP status if code == http.StatusNotFound { code = scode status = sstatus } // We take the worst of all statuses, so we keep iterating // passing: 200 < warning: 429 < critical: 503 if code < scode { code = scode status = sstatus } } } if returnTextPlain(req) { return status, CodeWithPayloadError{StatusCode: code, Reason: status, ContentType: "text/plain"} } return result, CodeWithPayloadError{StatusCode: code, Reason: status, ContentType: "application/json"} } func (s *HTTPServer) AgentRegisterService(resp http.ResponseWriter, req *http.Request) (interface{}, error) { var args structs.ServiceDefinition // Fixup the type decode of TTL or Interval if a check if provided. decodeCB := func(raw interface{}) error { rawMap, ok := raw.(map[string]interface{}) if !ok { return nil } // see https://github.com/hashicorp/consul/pull/3557 why we need this // and why we should get rid of it. lib.TranslateKeys(rawMap, map[string]string{ "enable_tag_override": "EnableTagOverride", // Managed Proxy Config "exec_mode": "ExecMode", // Proxy Upstreams "destination_name": "DestinationName", "destination_type": "DestinationType", "destination_namespace": "DestinationNamespace", "local_bind_port": "LocalBindPort", "local_bind_address": "LocalBindAddress", // Proxy Config "destination_service_name": "DestinationServiceName", "destination_service_id": "DestinationServiceID", "local_service_port": "LocalServicePort", "local_service_address": "LocalServiceAddress", // SidecarService "sidecar_service": "SidecarService", // DON'T Recurse into these opaque config maps or we might mangle user's // keys. Note empty canonical is a special sentinel to prevent recursion. "Meta": "", // upstreams is an array but this prevents recursion into config field of // any item in the array. "Proxy.Config": "", "Proxy.Upstreams.Config": "", "Connect.Proxy.Config": "", "Connect.Proxy.Upstreams.Config": "", // Same exceptions as above, but for a nested sidecar_service note we use // the canonical form SidecarService since that is translated by the time // the lookup here happens. Note that sidecar service doesn't support // managed proxies (connect.proxy). "Connect.SidecarService.Meta": "", "Connect.SidecarService.Proxy.Config": "", "Connect.SidecarService.Proxy.Upstreams.config": "", }) for k, v := range rawMap { switch strings.ToLower(k) { case "check": if err := FixupCheckType(v); err != nil { return err } case "checks": chkTypes, ok := v.([]interface{}) if !ok { continue } for _, chkType := range chkTypes { if err := FixupCheckType(chkType); err != nil { return err } } } } return nil } if err := decodeBody(req, &args, decodeCB); err != nil { resp.WriteHeader(http.StatusBadRequest) fmt.Fprintf(resp, "Request decode failed: %v", err) return nil, nil } // Verify the service has a name. if args.Name == "" { resp.WriteHeader(http.StatusBadRequest) fmt.Fprint(resp, "Missing service name") return nil, nil } // Check the service address here and in the catalog RPC endpoint // since service registration isn't synchronous. if ipaddr.IsAny(args.Address) { resp.WriteHeader(http.StatusBadRequest) fmt.Fprintf(resp, "Invalid service address") return nil, nil } // Get the node service. ns := args.NodeService() if ns.Weights != nil { if err := structs.ValidateWeights(ns.Weights); err != nil { resp.WriteHeader(http.StatusBadRequest) fmt.Fprint(resp, fmt.Errorf("Invalid Weights: %v", err)) return nil, nil } } if err := structs.ValidateMetadata(ns.Meta, false); err != nil { resp.WriteHeader(http.StatusBadRequest) fmt.Fprint(resp, fmt.Errorf("Invalid Service Meta: %v", err)) return nil, nil } // Run validation. This is the same validation that would happen on // the catalog endpoint so it helps ensure the sync will work properly. if err := ns.Validate(); err != nil { resp.WriteHeader(http.StatusBadRequest) fmt.Fprintf(resp, err.Error()) return nil, nil } // Verify the check type. chkTypes, err := args.CheckTypes() if err != nil { resp.WriteHeader(http.StatusBadRequest) fmt.Fprint(resp, fmt.Errorf("Invalid check: %v", err)) return nil, nil } for _, check := range chkTypes { if check.Status != "" && !structs.ValidStatus(check.Status) { resp.WriteHeader(http.StatusBadRequest) fmt.Fprint(resp, "Status for checks must 'passing', 'warning', 'critical'") return nil, nil } } // Verify the sidecar check types if args.Connect != nil && args.Connect.SidecarService != nil { chkTypes, err := args.Connect.SidecarService.CheckTypes() if err != nil { return nil, &BadRequestError{ Reason: fmt.Sprintf("Invalid check in sidecar_service: %v", err), } } for _, check := range chkTypes { if check.Status != "" && !structs.ValidStatus(check.Status) { return nil, &BadRequestError{ Reason: "Status for checks must 'passing', 'warning', 'critical'", } } } } // Get the provided token, if any, and vet against any ACL policies. var token string s.parseToken(req, &token) if err := s.agent.vetServiceRegister(token, ns); err != nil { return nil, err } // See if we have a sidecar to register too sidecar, sidecarChecks, sidecarToken, err := s.agent.sidecarServiceFromNodeService(ns, token) if err != nil { return nil, &BadRequestError{ Reason: fmt.Sprintf("Invalid SidecarService: %s", err)} } if sidecar != nil { // Make sure we are allowed to register the sidecar using the token // specified (might be specific to sidecar or the same one as the overall // request). if err := s.agent.vetServiceRegister(sidecarToken, sidecar); err != nil { return nil, err } // We parsed the sidecar registration, now remove it from the NodeService // for the actual service since it's done it's job and we don't want to // persist it in the actual state/catalog. SidecarService is meant to be a // registration syntax sugar so don't propagate it any further. ns.Connect.SidecarService = nil } // Get any proxy registrations proxy, err := args.ConnectManagedProxy() if err != nil { resp.WriteHeader(http.StatusBadRequest) fmt.Fprintf(resp, err.Error()) return nil, nil } // If we have a proxy, verify that we're allowed to add a proxy via the API if proxy != nil && !s.agent.config.ConnectProxyAllowManagedAPIRegistration { return nil, &BadRequestError{ Reason: "Managed proxy registration via the API is disallowed."} } // Add the service. if err := s.agent.AddService(ns, chkTypes, true, token, ConfigSourceRemote); err != nil { return nil, err } // Add proxy (which will add proxy service so do it before we trigger sync) if proxy != nil { if err := s.agent.AddProxy(proxy, true, false, "", ConfigSourceRemote); err != nil { return nil, err } } // Add sidecar. if sidecar != nil { if err := s.agent.AddService(sidecar, sidecarChecks, true, sidecarToken, ConfigSourceRemote); err != nil { return nil, err } } s.syncChanges() return nil, nil } func (s *HTTPServer) AgentDeregisterService(resp http.ResponseWriter, req *http.Request) (interface{}, error) { serviceID := strings.TrimPrefix(req.URL.Path, "/v1/agent/service/deregister/") // Get the provided token, if any, and vet against any ACL policies. var token string s.parseToken(req, &token) if err := s.agent.vetServiceUpdate(token, serviceID); err != nil { return nil, err } // Verify this isn't a proxy if s.agent.State.Proxy(serviceID) != nil { return nil, &BadRequestError{ Reason: "Managed proxy service cannot be deregistered directly. " + "Deregister the service that has a managed proxy to automatically " + "deregister the managed proxy itself."} } if err := s.agent.RemoveService(serviceID, true); err != nil { return nil, err } s.syncChanges() return nil, nil } func (s *HTTPServer) AgentServiceMaintenance(resp http.ResponseWriter, req *http.Request) (interface{}, error) { // Ensure we have a service ID serviceID := strings.TrimPrefix(req.URL.Path, "/v1/agent/service/maintenance/") if serviceID == "" { resp.WriteHeader(http.StatusBadRequest) fmt.Fprint(resp, "Missing service ID") return nil, nil } // Ensure we have some action params := req.URL.Query() if _, ok := params["enable"]; !ok { resp.WriteHeader(http.StatusBadRequest) fmt.Fprint(resp, "Missing value for enable") return nil, nil } raw := params.Get("enable") enable, err := strconv.ParseBool(raw) if err != nil { resp.WriteHeader(http.StatusBadRequest) fmt.Fprintf(resp, "Invalid value for enable: %q", raw) return nil, nil } // Get the provided token, if any, and vet against any ACL policies. var token string s.parseToken(req, &token) if err := s.agent.vetServiceUpdate(token, serviceID); err != nil { return nil, err } if enable { reason := params.Get("reason") if err = s.agent.EnableServiceMaintenance(serviceID, reason, token); err != nil { resp.WriteHeader(http.StatusNotFound) fmt.Fprint(resp, err.Error()) return nil, nil } } else { if err = s.agent.DisableServiceMaintenance(serviceID); err != nil { resp.WriteHeader(http.StatusNotFound) fmt.Fprint(resp, err.Error()) return nil, nil } } s.syncChanges() return nil, nil } func (s *HTTPServer) AgentNodeMaintenance(resp http.ResponseWriter, req *http.Request) (interface{}, error) { // Ensure we have some action params := req.URL.Query() if _, ok := params["enable"]; !ok { resp.WriteHeader(http.StatusBadRequest) fmt.Fprint(resp, "Missing value for enable") return nil, nil } raw := params.Get("enable") enable, err := strconv.ParseBool(raw) if err != nil { resp.WriteHeader(http.StatusBadRequest) fmt.Fprintf(resp, "Invalid value for enable: %q", raw) return nil, nil } // Get the provided token, if any, and vet against any ACL policies. var token string s.parseToken(req, &token) rule, err := s.agent.resolveToken(token) if err != nil { return nil, err } if rule != nil && !rule.NodeWrite(s.agent.config.NodeName, nil) { return nil, acl.ErrPermissionDenied } if enable { s.agent.EnableNodeMaintenance(params.Get("reason"), token) } else { s.agent.DisableNodeMaintenance() } s.syncChanges() return nil, nil } func (s *HTTPServer) AgentMonitor(resp http.ResponseWriter, req *http.Request) (interface{}, error) { // Fetch the ACL token, if any, and enforce agent policy. var token string s.parseToken(req, &token) rule, err := s.agent.resolveToken(token) if err != nil { return nil, err } if rule != nil && !rule.AgentRead(s.agent.config.NodeName) { return nil, acl.ErrPermissionDenied } // Get the provided loglevel. logLevel := req.URL.Query().Get("loglevel") if logLevel == "" { logLevel = "INFO" } // Upper case the level since that's required by the filter. logLevel = strings.ToUpper(logLevel) // Create a level filter and flusher. filter := logger.LevelFilter() filter.MinLevel = logutils.LogLevel(logLevel) if !logger.ValidateLevelFilter(filter.MinLevel, filter) { resp.WriteHeader(http.StatusBadRequest) fmt.Fprintf(resp, "Unknown log level: %s", filter.MinLevel) return nil, nil } flusher, ok := resp.(http.Flusher) if !ok { return nil, fmt.Errorf("Streaming not supported") } // Set up a log handler. handler := &httpLogHandler{ filter: filter, logCh: make(chan string, 512), logger: s.agent.logger, } s.agent.LogWriter.RegisterHandler(handler) defer s.agent.LogWriter.DeregisterHandler(handler) notify := resp.(http.CloseNotifier).CloseNotify() // Send header so client can start streaming body resp.WriteHeader(http.StatusOK) // 0 byte write is needed before the Flush call so that if we are using // a gzip stream it will go ahead and write out the HTTP response header resp.Write([]byte("")) flusher.Flush() // Stream logs until the connection is closed. for { select { case <-notify: s.agent.LogWriter.DeregisterHandler(handler) if handler.droppedCount > 0 { s.agent.logger.Printf("[WARN] agent: Dropped %d logs during monitor request", handler.droppedCount) } return nil, nil case log := <-handler.logCh: fmt.Fprintln(resp, log) flusher.Flush() } } } type httpLogHandler struct { filter *logutils.LevelFilter logCh chan string logger *log.Logger droppedCount int } func (h *httpLogHandler) HandleLog(log string) { // Check the log level if !h.filter.Check([]byte(log)) { return } // Do a non-blocking send select { case h.logCh <- log: default: // Just increment a counter for dropped logs to this handler; we can't log now // because the lock is already held by the LogWriter invoking this h.droppedCount++ } } func (s *HTTPServer) AgentToken(resp http.ResponseWriter, req *http.Request) (interface{}, error) { if s.checkACLDisabled(resp, req) { return nil, nil } // Fetch the ACL token, if any, and enforce agent policy. var token string s.parseToken(req, &token) rule, err := s.agent.resolveToken(token) if err != nil { return nil, err } if rule != nil && !rule.AgentWrite(s.agent.config.NodeName) { return nil, acl.ErrPermissionDenied } // The body is just the token, but it's in a JSON object so we can add // fields to this later if needed. var args api.AgentToken if err := decodeBody(req, &args, nil); err != nil { resp.WriteHeader(http.StatusBadRequest) fmt.Fprintf(resp, "Request decode failed: %v", err) return nil, nil } if s.agent.config.ACLEnableTokenPersistence { // we hold the lock around updating the internal token store // as well as persisting the tokens because we don't want to write // into the store to have something else wipe it out before we can // persist everything (like an agent config reload). The token store // lock is only held for those operations so other go routines that // just need to read some token out of the store will not be impacted // any more than they would be without token persistence. s.agent.persistedTokensLock.Lock() defer s.agent.persistedTokensLock.Unlock() } // Figure out the target token. target := strings.TrimPrefix(req.URL.Path, "/v1/agent/token/") switch target { case "acl_token", "default": s.agent.tokens.UpdateUserToken(args.Token, token_store.TokenSourceAPI) case "acl_agent_token", "agent": s.agent.tokens.UpdateAgentToken(args.Token, token_store.TokenSourceAPI) case "acl_agent_master_token", "agent_master": s.agent.tokens.UpdateAgentMasterToken(args.Token, token_store.TokenSourceAPI) case "acl_replication_token", "replication": s.agent.tokens.UpdateReplicationToken(args.Token, token_store.TokenSourceAPI) default: resp.WriteHeader(http.StatusNotFound) fmt.Fprintf(resp, "Token %q is unknown", target) return nil, nil } if s.agent.config.ACLEnableTokenPersistence { tokens := persistedTokens{} if tok, source := s.agent.tokens.UserTokenAndSource(); tok != "" && source == token_store.TokenSourceAPI { tokens.Default = tok } if tok, source := s.agent.tokens.AgentTokenAndSource(); tok != "" && source == token_store.TokenSourceAPI { tokens.Agent = tok } if tok, source := s.agent.tokens.AgentMasterTokenAndSource(); tok != "" && source == token_store.TokenSourceAPI { tokens.AgentMaster = tok } if tok, source := s.agent.tokens.ReplicationTokenAndSource(); tok != "" && source == token_store.TokenSourceAPI { tokens.Replication = tok } data, err := json.Marshal(tokens) if err != nil { s.agent.logger.Printf("[WARN] agent: failed to persist tokens - %v", err) return nil, fmt.Errorf("Failed to marshal tokens for persistence: %v", err) } if err := file.WriteAtomicWithPerms(filepath.Join(s.agent.config.DataDir, tokensPath), data, 0600); err != nil { s.agent.logger.Printf("[WARN] agent: failed to persist tokens - %v", err) return nil, fmt.Errorf("Failed to persist tokens - %v", err) } } s.agent.logger.Printf("[INFO] agent: Updated agent's ACL token %q", target) return nil, nil } // AgentConnectCARoots returns the trusted CA roots. func (s *HTTPServer) AgentConnectCARoots(resp http.ResponseWriter, req *http.Request) (interface{}, error) { var args structs.DCSpecificRequest if done := s.parse(resp, req, &args.Datacenter, &args.QueryOptions); done { return nil, nil } raw, m, err := s.agent.cache.Get(cachetype.ConnectCARootName, &args) if err != nil { return nil, err } defer setCacheMeta(resp, &m) // Add cache hit reply, ok := raw.(*structs.IndexedCARoots) if !ok { // This should never happen, but we want to protect against panics return nil, fmt.Errorf("internal error: response type not correct") } defer setMeta(resp, &reply.QueryMeta) return *reply, nil } // AgentConnectCALeafCert returns the certificate bundle for a service // instance. This supports blocking queries to update the returned bundle. func (s *HTTPServer) AgentConnectCALeafCert(resp http.ResponseWriter, req *http.Request) (interface{}, error) { // Get the service name. Note that this is the name of the service, // not the ID of the service instance. serviceName := strings.TrimPrefix(req.URL.Path, "/v1/agent/connect/ca/leaf/") args := cachetype.ConnectCALeafRequest{ Service: serviceName, // Need name not ID } var qOpts structs.QueryOptions // Store DC in the ConnectCALeafRequest but query opts separately // Don't resolve a proxy token to a real token that will be // done with a call to verifyProxyToken later along with // other security relevant checks. if done := s.parseWithoutResolvingProxyToken(resp, req, &args.Datacenter, &qOpts); done { return nil, nil } args.MinQueryIndex = qOpts.MinQueryIndex args.MaxQueryTime = qOpts.MaxQueryTime // Verify the proxy token. This will check both the local proxy token // as well as the ACL if the token isn't local. The checks done in // verifyProxyToken are still relevant because a leaf cert can be cached // verifying the proxy token matches the service id or that a real // acl token still is valid and has ServiceWrite is necessary or // that cached cert is potentially unprotected. effectiveToken, _, err := s.agent.verifyProxyToken(qOpts.Token, serviceName, "") if err != nil { return nil, err } args.Token = effectiveToken raw, m, err := s.agent.cache.Get(cachetype.ConnectCALeafName, &args) if err != nil { return nil, err } defer setCacheMeta(resp, &m) reply, ok := raw.(*structs.IssuedCert) if !ok { // This should never happen, but we want to protect against panics return nil, fmt.Errorf("internal error: response type not correct") } setIndex(resp, reply.ModifyIndex) return reply, nil } // GET /v1/agent/connect/proxy/:proxy_service_id // // Returns the local proxy config for the identified proxy. Requires token= // param with the correct local ProxyToken (not ACL token). func (s *HTTPServer) AgentConnectProxyConfig(resp http.ResponseWriter, req *http.Request) (interface{}, error) { // Get the proxy ID. Note that this is the ID of a proxy's service instance. id := strings.TrimPrefix(req.URL.Path, "/v1/agent/connect/proxy/") // Maybe block var queryOpts structs.QueryOptions if parseWait(resp, req, &queryOpts) { // parseWait returns an error itself return nil, nil } // Parse the token - don't resolve a proxy token to a real token // that will be done with a call to verifyProxyToken later along with // other security relevant checks. var token string s.parseTokenWithoutResolvingProxyToken(req, &token) // Parse hash specially since it's only this endpoint that uses it currently. // Eventually this should happen in parseWait and end up in QueryOptions but I // didn't want to make very general changes right away. hash := req.URL.Query().Get("hash") return s.agentLocalBlockingQuery(resp, hash, &queryOpts, func(ws memdb.WatchSet) (string, interface{}, error) { // Retrieve the proxy specified proxy := s.agent.State.Proxy(id) if proxy == nil { resp.WriteHeader(http.StatusNotFound) fmt.Fprintf(resp, "unknown proxy service ID: %s", id) return "", nil, nil } // Lookup the target service as a convenience target := s.agent.State.Service(proxy.Proxy.TargetServiceID) if target == nil { // Not found since this endpoint is only useful for agent-managed proxies so // service missing means the service was deregistered racily with this call. resp.WriteHeader(http.StatusNotFound) fmt.Fprintf(resp, "unknown target service ID: %s", proxy.Proxy.TargetServiceID) return "", nil, nil } // Validate the ACL token - because this endpoint uses data local to a single // agent, this function is responsible for all enforcement regarding // protection of the configuration. verifyProxyToken will match the proxies // token to the correct service or in the case of being provide a real ACL // token it will ensure that the requester has ServiceWrite privileges // for this service. _, isProxyToken, err := s.agent.verifyProxyToken(token, target.Service, id) if err != nil { return "", nil, err } // Watch the proxy for changes ws.Add(proxy.WatchCh) hash, err := hashstructure.Hash(proxy.Proxy, nil) if err != nil { return "", nil, err } contentHash := fmt.Sprintf("%x", hash) // Set defaults config, err := s.agent.applyProxyConfigDefaults(proxy.Proxy) if err != nil { return "", nil, err } // Only merge in telemetry config from agent if the requested is // authorized with a proxy token. This prevents us leaking potentially // sensitive config like Circonus API token via a public endpoint. Proxy // tokens are only ever generated in-memory and passed via ENV to a child // proxy process so potential for abuse here seems small. This endpoint in // general is only useful for managed proxies now so it should _always_ be // true that auth is via a proxy token but inconvenient for testing if we // lock it down so strictly. if isProxyToken { // Add telemetry config. Copy the global config so we can customize the // prefix. telemetryCfg := s.agent.config.Telemetry telemetryCfg.MetricsPrefix = telemetryCfg.MetricsPrefix + ".proxy." + target.ID // First see if the user has specified telemetry if userRaw, ok := config["telemetry"]; ok { // User specified domething, see if it is compatible with agent // telemetry config: var uCfg lib.TelemetryConfig dec, err := mapstructure.NewDecoder(&mapstructure.DecoderConfig{ Result: &uCfg, // Make sure that if the user passes something that isn't just a // simple override of a valid TelemetryConfig that we fail so that we // don't clobber their custom config. ErrorUnused: true, }) if err == nil { if err = dec.Decode(userRaw); err == nil { // It did decode! Merge any unspecified fields from agent config. uCfg.MergeDefaults(&telemetryCfg) config["telemetry"] = uCfg } } // Failed to decode, just keep user's config["telemetry"] verbatim // with no agent merge. } else { // Add agent telemetry config. config["telemetry"] = telemetryCfg } } reply := &api.ConnectProxyConfig{ ProxyServiceID: proxy.Proxy.ProxyService.ID, TargetServiceID: target.ID, TargetServiceName: target.Service, ContentHash: contentHash, ExecMode: api.ProxyExecMode(proxy.Proxy.ExecMode.String()), Command: proxy.Proxy.Command, Config: config, Upstreams: proxy.Proxy.Upstreams.ToAPI(), } return contentHash, reply, nil }) } type agentLocalBlockingFunc func(ws memdb.WatchSet) (string, interface{}, error) // agentLocalBlockingQuery performs a blocking query in a generic way against // local agent state that has no RPC or raft to back it. It uses `hash` parameter // instead of an `index`. The resp is needed to write the `X-Consul-ContentHash` // header back on return no Status nor body content is ever written to it. func (s *HTTPServer) agentLocalBlockingQuery(resp http.ResponseWriter, hash string, queryOpts *structs.QueryOptions, fn agentLocalBlockingFunc) (interface{}, error) { // If we are not blocking we can skip tracking and allocating - nil WatchSet // is still valid to call Add on and will just be a no op. var ws memdb.WatchSet var timeout *time.Timer if hash != "" { // TODO(banks) at least define these defaults somewhere in a const. Would be // nice not to duplicate the ones in consul/rpc.go too... wait := queryOpts.MaxQueryTime if wait == 0 { wait = 5 * time.Minute } if wait > 10*time.Minute { wait = 10 * time.Minute } // Apply a small amount of jitter to the request. wait += lib.RandomStagger(wait / 16) timeout = time.NewTimer(wait) } for { // Must reset this every loop in case the Watch set is already closed but // hash remains same. In that case we'll need to re-block on ws.Watch() // again. ws = memdb.NewWatchSet() curHash, curResp, err := fn(ws) if err != nil { return curResp, err } // Return immediately if there is no timeout, the hash is different or the // Watch returns true (indicating timeout fired). Note that Watch on a nil // WatchSet immediately returns false which would incorrectly cause this to // loop and repeat again, however we rely on the invariant that ws == nil // IFF timeout == nil in which case the Watch call is never invoked. if timeout == nil || hash != curHash || ws.Watch(timeout.C) { resp.Header().Set("X-Consul-ContentHash", curHash) return curResp, err } // Watch returned false indicating a change was detected, loop and repeat // the callback to load the new value. If agent sync is paused it means // local state is currently being bulk-edited e.g. config reload. In this // case it's likely that local state just got unloaded and may or may not be // reloaded yet. Wait a short amount of time for Sync to resume to ride out // typical config reloads. if syncPauseCh := s.agent.syncPausedCh(); syncPauseCh != nil { select { case <-syncPauseCh: case <-timeout.C: } } } } // AgentConnectAuthorize // // POST /v1/agent/connect/authorize // // Note: when this logic changes, consider if the Intention.Check RPC method // also needs to be updated. func (s *HTTPServer) AgentConnectAuthorize(resp http.ResponseWriter, req *http.Request) (interface{}, error) { // Fetch the token var token string s.parseToken(req, &token) // Decode the request from the request body var authReq structs.ConnectAuthorizeRequest if err := decodeBody(req, &authReq, nil); err != nil { return nil, BadRequestError{fmt.Sprintf("Request decode failed: %v", err)} } authz, reason, cacheMeta, err := s.agent.ConnectAuthorize(token, &authReq) if err != nil { return nil, err } setCacheMeta(resp, cacheMeta) return &connectAuthorizeResp{ Authorized: authz, Reason: reason, }, nil } // connectAuthorizeResp is the response format/structure for the // /v1/agent/connect/authorize endpoint. type connectAuthorizeResp struct { Authorized bool // True if authorized, false if not Reason string // Reason for the Authorized value (whether true or false) } // AgentHost // // GET /v1/agent/host // // Retrieves information about resources available and in-use for the // host the agent is running on such as CPU, memory, and disk usage. Requires // a operator:read ACL token. func (s *HTTPServer) AgentHost(resp http.ResponseWriter, req *http.Request) (interface{}, error) { // Fetch the ACL token, if any, and enforce agent policy. var token string s.parseToken(req, &token) rule, err := s.agent.resolveToken(token) if err != nil { return nil, err } if rule != nil && !rule.OperatorRead() { return nil, acl.ErrPermissionDenied } return debug.CollectHostInfo(), nil }