package agent import ( "fmt" "log" "net/http" "net/url" "strconv" "strings" "time" "github.com/hashicorp/go-memdb" "github.com/mitchellh/hashstructure" "github.com/hashicorp/consul/acl" "github.com/hashicorp/consul/agent/cache-types" "github.com/hashicorp/consul/agent/checks" "github.com/hashicorp/consul/agent/config" "github.com/hashicorp/consul/agent/connect" "github.com/hashicorp/consul/agent/structs" "github.com/hashicorp/consul/api" "github.com/hashicorp/consul/ipaddr" "github.com/hashicorp/consul/lib" "github.com/hashicorp/consul/logger" "github.com/hashicorp/consul/types" "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.TelemetryPrometheusRetentionTime < 1 { resp.WriteHeader(http.StatusUnsupportedMediaType) fmt.Fprint(resp, "Prometheus is not enable 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, 0) 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 (s *HTTPServer) AgentServices(resp http.ResponseWriter, req *http.Request) (interface{}, error) { // Fetch the ACL token, if any. var token string s.parseToken(req, &token) 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 { 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, ProxyDestination: s.ProxyDestination, } if as.Tags == nil { as.Tags = []string{} } if as.Meta == nil { as.Meta = map[string]string{} } // Attach Connect configs if the exist if proxy, ok := proxies[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, }, } } agentSvcs[id] = as } return agentSvcs, 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) 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 checks, nil } 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 } // 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); 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 } total := len(update.Output) if total > checks.BufSize { update.Output = fmt.Sprintf("%s ... (captured %d of %d bytes)", update.Output[:checks.BufSize], checks.BufSize, total) } 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 } 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. config.TranslateKeys(rawMap, map[string]string{ "enable_tag_override": "EnableTagOverride", }) 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 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 } } // 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 } // Get any proxy registrations proxy, err := args.ConnectManagedProxy() if err != nil { resp.WriteHeader(http.StatusBadRequest) fmt.Fprintf(resp, err.Error()) return nil, nil } // Add the service. if err := s.agent.AddService(ns, chkTypes, true, token); 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, ""); 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 } 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 } // Figure out the target token. target := strings.TrimPrefix(req.URL.Path, "/v1/agent/token/") switch target { case "acl_token": s.agent.tokens.UpdateUserToken(args.Token) case "acl_agent_token": s.agent.tokens.UpdateAgentToken(args.Token) case "acl_agent_master_token": s.agent.tokens.UpdateAgentMasterToken(args.Token) case "acl_replication_token": s.agent.tokens.UpdateACLReplicationToken(args.Token) default: resp.WriteHeader(http.StatusNotFound) fmt.Fprintf(resp, "Token %q is unknown", target) return nil, nil } 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, err := s.agent.cache.Get(cachetype.ConnectCARootName, &args) if err != nil { return nil, err } 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 sevice, // 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 if done := s.parse(resp, req, &args.Datacenter, &qOpts); done { return nil, nil } args.MinQueryIndex = qOpts.MinQueryIndex // Verify the proxy token. This will check both the local proxy token // as well as the ACL if the token isn't local. effectiveToken, err := s.agent.verifyProxyToken(qOpts.Token, serviceName, "") if err != nil { return nil, err } args.Token = effectiveToken raw, err := s.agent.cache.Get(cachetype.ConnectCALeafName, &args) if err != nil { return nil, err } 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 var token string s.parseToken(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 _, 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) // Merge globals defaults config := make(map[string]interface{}) for k, v := range s.agent.config.ConnectProxyDefaultConfig { if _, ok := config[k]; !ok { config[k] = v } } // Set defaults for anything that is still not specified but required. // Note that these are not included in the content hash. Since we expect // them to be static in general but some like the default target service // port might not be. In that edge case services can set that explicitly // when they re-register which will be caught though. for k, v := range proxy.Proxy.Config { config[k] = v } if _, ok := config["bind_port"]; !ok { config["bind_port"] = proxy.Proxy.ProxyService.Port } if _, ok := config["bind_address"]; !ok { // Default to binding to the same address the agent is configured to // bind to. config["bind_address"] = s.agent.config.BindAddr.String() } if _, ok := config["local_service_address"]; !ok { // Default to localhost and the port the service registered with config["local_service_address"] = fmt.Sprintf("127.0.0.1:%d", target.Port) } 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, } 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` paramter // 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. } } // 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 { resp.WriteHeader(http.StatusBadRequest) fmt.Fprintf(resp, "Request decode failed: %v", err) return nil, nil } // We need to have a target to check intentions if authReq.Target == "" { resp.WriteHeader(http.StatusBadRequest) fmt.Fprintf(resp, "Target service must be specified") return nil, nil } // Parse the certificate URI from the client ID uriRaw, err := url.Parse(authReq.ClientCertURI) if err != nil { return &connectAuthorizeResp{ Authorized: false, Reason: fmt.Sprintf("Client ID must be a URI: %s", err), }, nil } uri, err := connect.ParseCertURI(uriRaw) if err != nil { return &connectAuthorizeResp{ Authorized: false, Reason: fmt.Sprintf("Invalid client ID: %s", err), }, nil } uriService, ok := uri.(*connect.SpiffeIDService) if !ok { return &connectAuthorizeResp{ Authorized: false, Reason: "Client ID must be a valid SPIFFE service URI", }, nil } // We need to verify service:write permissions for the given token. // We do this manually here since the RPC request below only verifies // service:read. rule, err := s.agent.resolveToken(token) if err != nil { return nil, err } if rule != nil && !rule.ServiceWrite(authReq.Target, nil) { return nil, acl.ErrPermissionDenied } // Validate the trust domain matches ours. Later we will support explicit // external federation but not built yet. rootArgs := &structs.DCSpecificRequest{Datacenter: s.agent.config.Datacenter} raw, err := s.agent.cache.Get(cachetype.ConnectCARootName, rootArgs) if err != nil { return nil, err } roots, ok := raw.(*structs.IndexedCARoots) if !ok { return nil, fmt.Errorf("internal error: roots response type not correct") } if roots.TrustDomain == "" { return nil, fmt.Errorf("connect CA not bootstrapped yet") } if roots.TrustDomain != strings.ToLower(uriService.Host) { return &connectAuthorizeResp{ Authorized: false, Reason: fmt.Sprintf("Identity from an external trust domain: %s", uriService.Host), }, nil } // TODO(banks): Implement revocation list checking here. // Get the intentions for this target service. args := &structs.IntentionQueryRequest{ Datacenter: s.agent.config.Datacenter, Match: &structs.IntentionQueryMatch{ Type: structs.IntentionMatchDestination, Entries: []structs.IntentionMatchEntry{ { Namespace: structs.IntentionDefaultNamespace, Name: authReq.Target, }, }, }, } args.Token = token raw, err = s.agent.cache.Get(cachetype.IntentionMatchName, args) if err != nil { return nil, err } reply, ok := raw.(*structs.IndexedIntentionMatches) if !ok { return nil, fmt.Errorf("internal error: response type not correct") } if len(reply.Matches) != 1 { return nil, fmt.Errorf("Internal error loading matches") } // Test the authorization for each match for _, ixn := range reply.Matches[0] { if auth, ok := uriService.Authorize(ixn); ok { return &connectAuthorizeResp{ Authorized: auth, Reason: fmt.Sprintf("Matched intention: %s", ixn.String()), }, nil } } // No match, we need to determine the default behavior. We do this by // specifying the anonymous token token, which will get that behavior. // The default behavior if ACLs are disabled is to allow connections // to mimic the behavior of Consul itself: everything is allowed if // ACLs are disabled. rule, err = s.agent.resolveToken("") if err != nil { return nil, err } authz := true reason := "ACLs disabled, access is allowed by default" if rule != nil { authz = rule.IntentionDefaultAllow() reason = "Default behavior configured by ACLs" } 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) }