Merge pull request #8086 from hashicorp/feature/auto-config/client-config-inject

agent/acl.go

@@ -187,11 +187,11 @@ func (a *Agent) vetCheckRegisterWithAuthorizer(authz acl.Authorizer, check *stru
 	// Vet the check itself.
 	if len(check.ServiceName) > 0 {
 		if authz.ServiceWrite(check.ServiceName, &authzContext) != acl.Allow {
-			return acl.ErrPermissionDenied
+			return acl.PermissionDenied("Missing service:write on %v", structs.ServiceIDString(check.ServiceName, &check.EnterpriseMeta))
 		}
 	} else {
 		if authz.NodeWrite(a.config.NodeName, &authzContext) != acl.Allow {
-			return acl.ErrPermissionDenied
+			return acl.PermissionDenied("Missing node:write on %s", a.config.NodeName)
 		}
 	}
 
@@ -199,11 +199,11 @@ func (a *Agent) vetCheckRegisterWithAuthorizer(authz acl.Authorizer, check *stru
 	if existing := a.State.Check(check.CompoundCheckID()); existing != nil {
 		if len(existing.ServiceName) > 0 {
 			if authz.ServiceWrite(existing.ServiceName, &authzContext) != acl.Allow {
-				return acl.ErrPermissionDenied
+				return acl.PermissionDenied("Missing service:write on %s", structs.ServiceIDString(existing.ServiceName, &existing.EnterpriseMeta))
 			}
 		} else {
 			if authz.NodeWrite(a.config.NodeName, &authzContext) != acl.Allow {
-				return acl.ErrPermissionDenied
+				return acl.PermissionDenied("Missing node:write on %s", a.config.NodeName)
 			}
 		}
 	}

agent/acl_test.go

@@ -57,7 +57,7 @@ type TestACLAgent struct {
 // The key is that we are the delegate so we can control the ResolveToken responses
 func NewTestACLAgent(t *testing.T, name string, hcl string, resolveAuthz authzResolver, resolveIdent identResolver) *TestACLAgent {
 	a := &TestACLAgent{Name: name, HCL: hcl, resolveAuthzFn: resolveAuthz, resolveIdentFn: resolveIdent}
-	hclDataDir := `data_dir = "acl-agent"`
+	dataDir := `data_dir = "acl-agent"`
 
 	logOutput := testutil.TestWriter(t)
 	logger := hclog.NewInterceptLogger(&hclog.LoggerOptions{
@@ -66,13 +66,20 @@ func NewTestACLAgent(t *testing.T, name string, hcl string, resolveAuthz authzRe
 		Output: logOutput,
 	})
 
-	a.Config = TestConfig(logger,
+	opts := []AgentOption{
-		config.Source{Name: a.Name, Format: "hcl", Data: a.HCL},
+		WithLogger(logger),
-		config.Source{Name: a.Name + ".data_dir", Format: "hcl", Data: hclDataDir},
+		WithBuilderOpts(config.BuilderOpts{
-	)
+			HCL: []string{
+				TestConfigHCL(NodeID()),
+				a.HCL,
+				dataDir,
+			},
+		}),
+	}
 
-	agent, err := New(a.Config, logger)
+	agent, err := New(opts...)
 	require.NoError(t, err)
+	a.Config = agent.GetConfig()
 	a.Agent = agent
 
 	agent.LogOutput = logOutput
@@ -258,7 +265,7 @@ var (
 		nodeRWSecret: {
 			token: structs.ACLToken{
 				AccessorID: "efb6b7d5-d343-47c1-b4cb-aa6b94d2f490",
-				SecretID:   nodeROSecret,
+				SecretID:   nodeRWSecret,
 			},
 			rules: `node_prefix "Node" { policy = "write" }`,
 		},

agent/agent.go

@@ -21,18 +21,22 @@ import (
 	"github.com/hashicorp/go-connlimit"
 	"github.com/hashicorp/go-hclog"
 	"github.com/hashicorp/go-memdb"
+	"github.com/mitchellh/cli"
 
 	"google.golang.org/grpc"
+	"google.golang.org/grpc/grpclog"
 
 	"github.com/armon/go-metrics"
 	"github.com/hashicorp/consul/acl"
 	"github.com/hashicorp/consul/agent/ae"
+	autoconf "github.com/hashicorp/consul/agent/auto-config"
 	"github.com/hashicorp/consul/agent/cache"
 	cachetype "github.com/hashicorp/consul/agent/cache-types"
 	"github.com/hashicorp/consul/agent/checks"
 	"github.com/hashicorp/consul/agent/config"
 	"github.com/hashicorp/consul/agent/consul"
 	"github.com/hashicorp/consul/agent/local"
+	"github.com/hashicorp/consul/agent/pool"
 	"github.com/hashicorp/consul/agent/proxycfg"
 	"github.com/hashicorp/consul/agent/structs"
 	"github.com/hashicorp/consul/agent/systemd"
@@ -160,6 +164,8 @@ type notifier interface {
 // mode, it runs a full Consul server. In client-only mode, it only forwards
 // requests to other Consul servers.
 type Agent struct {
+	autoConf *autoconf.AutoConfig
+
 	// config is the agent configuration.
 	config *config.RuntimeConfig
 
@@ -247,8 +253,6 @@ type Agent struct {
 	eventLock   sync.RWMutex
 	eventNotify NotifyGroup
 
-	reloadCh chan chan error
-
 	shutdown     bool
 	shutdownCh   chan struct{}
 	shutdownLock sync.Mutex
@@ -313,22 +317,103 @@ type Agent struct {
 	// IP.
 	httpConnLimiter connlimit.Limiter
 
+	// Connection Pool
+	connPool *pool.ConnPool
+
 	// enterpriseAgent embeds fields that we only access in consul-enterprise builds
 	enterpriseAgent
 }
 
-// New verifies the configuration given has a Datacenter and DataDir
+type agentOptions struct {
-// configured, and maps the remaining config fields to fields on the Agent.
+	logger      hclog.InterceptLogger
-func New(c *config.RuntimeConfig, logger hclog.InterceptLogger) (*Agent, error) {
+	builderOpts config.BuilderOpts
-	if c.Datacenter == "" {
+	ui          cli.Ui
-		return nil, fmt.Errorf("Must configure a Datacenter")
+	config      *config.RuntimeConfig
-	}
+	overrides   []config.Source
-	if c.DataDir == "" && !c.DevMode {
+	writers     []io.Writer
-		return nil, fmt.Errorf("Must configure a DataDir")
 }
 
+type AgentOption func(opt *agentOptions)
+
+// WithLogger is used to override any automatic logger creation
+// and provide one already built instead. This is mostly useful
+// for testing.
+func WithLogger(logger hclog.InterceptLogger) AgentOption {
+	return func(opt *agentOptions) {
+		opt.logger = logger
+	}
+}
+
+// WithBuilderOpts specifies the command line config.BuilderOpts to use that the agent
+// is being started with
+func WithBuilderOpts(builderOpts config.BuilderOpts) AgentOption {
+	return func(opt *agentOptions) {
+		opt.builderOpts = builderOpts
+	}
+}
+
+// WithCLI provides a cli.Ui instance to use when emitting configuration
+// warnings during the first configuration parsing.
+func WithCLI(ui cli.Ui) AgentOption {
+	return func(opt *agentOptions) {
+		opt.ui = ui
+	}
+}
+
+// WithLogWriter will add an additional log output to the logger that gets
+// configured after configuration parsing
+func WithLogWriter(writer io.Writer) AgentOption {
+	return func(opt *agentOptions) {
+		opt.writers = append(opt.writers, writer)
+	}
+}
+
+// WithOverrides is used to provide a config source to append to the tail sources
+// during config building. It is really only useful for testing to tune non-user
+// configurable tunables to make various tests converge more quickly than they
+// could otherwise.
+func WithOverrides(overrides ...config.Source) AgentOption {
+	return func(opt *agentOptions) {
+		opt.overrides = overrides
+	}
+}
+
+// WithConfig provides an already parsed configuration to the Agent
+// Deprecated: Should allow the agent to parse the configuration.
+func WithConfig(config *config.RuntimeConfig) AgentOption {
+	return func(opt *agentOptions) {
+		opt.config = config
+	}
+}
+
+func flattenAgentOptions(options []AgentOption) agentOptions {
+	var flat agentOptions
+	for _, opt := range options {
+		opt(&flat)
+	}
+	return flat
+}
+
+// New process the desired options and creates a new Agent.
+// This process will
+//   * parse the config given the config Flags
+//   * setup logging
+//      * using predefined logger given in an option
+//        OR
+//      * initialize a new logger from the configuration
+//        including setting up gRPC logging
+//   * initialize telemetry
+//   * create a TLS Configurator
+//   * build a shared connection pool
+//   * create the ServiceManager
+//   * setup the NodeID if one isn't provided in the configuration
+//   * create the AutoConfig object for future use in fully
+//     resolving the configuration
+func New(options ...AgentOption) (*Agent, error) {
+	flat := flattenAgentOptions(options)
+
+	// Create most of the agent
 	a := Agent{
-		config:           c,
 		checkReapAfter:   make(map[structs.CheckID]time.Duration),
 		checkMonitors:    make(map[structs.CheckID]*checks.CheckMonitor),
 		checkTTLs:        make(map[structs.CheckID]*checks.CheckTTL),
@@ -340,14 +425,84 @@ func New(c *config.RuntimeConfig, logger hclog.InterceptLogger) (*Agent, error)
 		eventCh:          make(chan serf.UserEvent, 1024),
 		eventBuf:         make([]*UserEvent, 256),
 		joinLANNotifier:  &systemd.Notifier{},
-		reloadCh:         make(chan chan error),
 		retryJoinCh:      make(chan error),
 		shutdownCh:       make(chan struct{}),
 		InterruptStartCh: make(chan struct{}),
 		endpoints:        make(map[string]string),
 		tokens:           new(token.Store),
-		logger:           logger,
+		logger:           flat.logger,
 	}
+
+	// parse the configuration and handle the error/warnings
+	config, warnings, err := autoconf.LoadConfig(flat.builderOpts, config.Source{}, flat.overrides...)
+	if err != nil {
+		return nil, err
+	}
+	for _, w := range warnings {
+		if a.logger != nil {
+			a.logger.Warn(w)
+		} else if flat.ui != nil {
+			flat.ui.Warn(w)
+		} else {
+			fmt.Fprint(os.Stderr, w)
+		}
+	}
+
+	// set the config in the agent, this is just the preliminary configuration as we haven't
+	// loaded any auto-config sources yet.
+	a.config = config
+
+	if flat.logger == nil {
+		logConf := &logging.Config{
+			LogLevel:          config.LogLevel,
+			LogJSON:           config.LogJSON,
+			Name:              logging.Agent,
+			EnableSyslog:      config.EnableSyslog,
+			SyslogFacility:    config.SyslogFacility,
+			LogFilePath:       config.LogFile,
+			LogRotateDuration: config.LogRotateDuration,
+			LogRotateBytes:    config.LogRotateBytes,
+			LogRotateMaxFiles: config.LogRotateMaxFiles,
+		}
+
+		logger, logOutput, err := logging.Setup(logConf, flat.writers)
+		if err != nil {
+			return nil, err
+		}
+
+		a.logger = logger
+		a.LogOutput = logOutput
+
+		grpclog.SetLoggerV2(logging.NewGRPCLogger(logConf, a.logger))
+	}
+
+	memSink, err := lib.InitTelemetry(config.Telemetry)
+	if err != nil {
+		return nil, fmt.Errorf("Failed to initialize telemetry: %w", err)
+	}
+	a.MemSink = memSink
+
+	// TODO (autoconf) figure out how to let this setting be pushed down via autoconf
+	// right now it gets defaulted if unset so this check actually doesn't do much
+	// for a normal running agent.
+	if a.config.Datacenter == "" {
+		return nil, fmt.Errorf("Must configure a Datacenter")
+	}
+	if a.config.DataDir == "" && !a.config.DevMode {
+		return nil, fmt.Errorf("Must configure a DataDir")
+	}
+
+	tlsConfigurator, err := tlsutil.NewConfigurator(a.config.ToTLSUtilConfig(), a.logger)
+	if err != nil {
+		return nil, err
+	}
+	a.tlsConfigurator = tlsConfigurator
+
+	err = a.initializeConnectionPool()
+	if err != nil {
+		return nil, fmt.Errorf("Failed to initialize the connection pool: %w", err)
+	}
+
 	a.serviceManager = NewServiceManager(&a)
 
 	if err := a.initializeACLs(); err != nil {
@@ -356,13 +511,76 @@ func New(c *config.RuntimeConfig, logger hclog.InterceptLogger) (*Agent, error)
 
 	// Retrieve or generate the node ID before setting up the rest of the
 	// agent, which depends on it.
-	if err := a.setupNodeID(c); err != nil {
+	if err := a.setupNodeID(a.config); err != nil {
 		return nil, fmt.Errorf("Failed to setup node ID: %v", err)
 	}
 
+	acOpts := []autoconf.Option{
+		autoconf.WithDirectRPC(a.connPool),
+		autoconf.WithTLSConfigurator(a.tlsConfigurator),
+		autoconf.WithBuilderOpts(flat.builderOpts),
+		autoconf.WithLogger(a.logger),
+		autoconf.WithOverrides(flat.overrides...),
+	}
+	ac, err := autoconf.New(acOpts...)
+	if err != nil {
+		return nil, err
+	}
+
+	a.autoConf = ac
+
 	return &a, nil
 }
 
+// GetLogger retrieves the agents logger
+// TODO make export the logger field and get rid of this method
+// This is here for now to simplify the work I am doing and make
+// reviewing the final PR easier.
+func (a *Agent) GetLogger() hclog.InterceptLogger {
+	return a.logger
+}
+
+// GetConfig retrieves the agents config
+// TODO make export the config field and get rid of this method
+// This is here for now to simplify the work I am doing and make
+// reviewing the final PR easier.
+func (a *Agent) GetConfig() *config.RuntimeConfig {
+	a.stateLock.Lock()
+	defer a.stateLock.Unlock()
+	return a.config
+}
+
+func (a *Agent) initializeConnectionPool() error {
+	var rpcSrcAddr *net.TCPAddr
+	if !ipaddr.IsAny(a.config.RPCBindAddr) {
+		rpcSrcAddr = &net.TCPAddr{IP: a.config.RPCBindAddr.IP}
+	}
+
+	// Ensure we have a log output for the connection pool.
+	logOutput := a.LogOutput
+	if logOutput == nil {
+		logOutput = os.Stderr
+	}
+
+	pool := &pool.ConnPool{
+		Server:          a.config.ServerMode,
+		SrcAddr:         rpcSrcAddr,
+		LogOutput:       logOutput,
+		TLSConfigurator: a.tlsConfigurator,
+		Datacenter:      a.config.Datacenter,
+	}
+	if a.config.ServerMode {
+		pool.MaxTime = 2 * time.Minute
+		pool.MaxStreams = 64
+	} else {
+		pool.MaxTime = 127 * time.Second
+		pool.MaxStreams = 32
+	}
+
+	a.connPool = pool
+	return nil
+}
+
 // LocalConfig takes a config.RuntimeConfig and maps the fields to a local.Config
 func LocalConfig(cfg *config.RuntimeConfig) local.Config {
 	lc := local.Config{
@@ -385,7 +603,23 @@ func (a *Agent) Start() error {
 	a.stateLock.Lock()
 	defer a.stateLock.Unlock()
 
-	c := a.config
+	// This needs to be done early on as it will potentially alter the configuration
+	// and then how other bits are brought up
+	c, err := a.autoConf.InitialConfiguration(&lib.StopChannelContext{StopCh: a.shutdownCh})
+	if err != nil {
+		return err
+	}
+
+	// copy over the existing node id, this cannot be
+	// changed while running anyways but this prevents
+	// breaking some existing behavior. then overwrite
+	// the configuration
+	c.NodeID = a.config.NodeID
+	a.config = c
+
+	if err := a.tlsConfigurator.Update(a.config.ToTLSUtilConfig()); err != nil {
+		return fmt.Errorf("Failed to load TLS configurations after applying auto-config settings: %w", err)
+	}
 
 	if err := a.CheckSecurity(c); err != nil {
 		a.logger.Error("Security error while parsing configuration: %#v", err)
@@ -438,21 +672,22 @@ func (a *Agent) Start() error {
 		return fmt.Errorf("failed to start Consul enterprise component: %v", err)
 	}
 
-	tlsConfigurator, err := tlsutil.NewConfigurator(c.ToTLSUtilConfig(), a.logger)
+	options := []consul.ConsulOption{
-	if err != nil {
+		consul.WithLogger(a.logger),
-		return err
+		consul.WithTokenStore(a.tokens),
+		consul.WithTLSConfigurator(a.tlsConfigurator),
+		consul.WithConnectionPool(a.connPool),
 	}
-	a.tlsConfigurator = tlsConfigurator
 
 	// Setup either the client or the server.
 	if c.ServerMode {
-		server, err := consul.NewServerLogger(consulCfg, a.logger, a.tokens, a.tlsConfigurator)
+		server, err := consul.NewServerWithOptions(consulCfg, options...)
 		if err != nil {
 			return fmt.Errorf("Failed to start Consul server: %v", err)
 		}
 		a.delegate = server
 	} else {
-		client, err := consul.NewClientLogger(consulCfg, a.logger, a.tlsConfigurator)
+		client, err := consul.NewClientWithOptions(consulCfg, options...)
 		if err != nil {
 			return fmt.Errorf("Failed to start Consul client: %v", err)
 		}
@@ -1873,12 +2108,6 @@ func (a *Agent) ShutdownEndpoints() {
 	a.logger.Info("Endpoints down")
 }
 
-// ReloadCh is used to return a channel that can be
-// used for triggering reloads and returning a response.
-func (a *Agent) ReloadCh() chan chan error {
-	return a.reloadCh
-}
-
 // RetryJoinCh is a channel that transports errors
 // from the retry join process.
 func (a *Agent) RetryJoinCh() <-chan error {
@@ -4052,14 +4281,40 @@ func (a *Agent) loadLimits(conf *config.RuntimeConfig) {
 	a.config.RPCMaxBurst = conf.RPCMaxBurst
 }
 
-// ReloadConfig will atomically reload all configs from the given newCfg,
+// ReloadConfig will atomically reload all configuration, including
-// including all services, checks, tokens, metadata, dnsServer configs, etc.
+// all services, checks, tokens, metadata, dnsServer configs, etc.
 // It will also reload all ongoing watches.
-func (a *Agent) ReloadConfig(newCfg *config.RuntimeConfig) error {
+func (a *Agent) ReloadConfig() error {
+	newCfg, err := a.autoConf.ReadConfig()
+	if err != nil {
+		return err
+	}
+
+	// copy over the existing node id, this cannot be
+	// changed while running anyways but this prevents
+	// breaking some existing behavior.
+	newCfg.NodeID = a.config.NodeID
+
+	return a.reloadConfigInternal(newCfg)
+}
+
+// reloadConfigInternal is mainly needed for some unit tests. Instead of parsing
+// the configuration using CLI flags and on disk config, this just takes a
+// runtime configuration and applies it.
+func (a *Agent) reloadConfigInternal(newCfg *config.RuntimeConfig) error {
 	if err := a.CheckSecurity(newCfg); err != nil {
 		a.logger.Error("Security error while reloading configuration: %#v", err)
 		return err
 	}
+
+	// Change the log level and update it
+	if logging.ValidateLogLevel(newCfg.LogLevel) {
+		a.logger.SetLevel(logging.LevelFromString(newCfg.LogLevel))
+	} else {
+		a.logger.Warn("Invalid log level in new configuration", "level", newCfg.LogLevel)
+		newCfg.LogLevel = a.config.LogLevel
+	}
+
 	// Bulk update the services and checks
 	a.PauseSync()
 	defer a.ResumeSync()

agent/agent_endpoint.go

@@ -154,21 +154,7 @@ func (s *HTTPServer) AgentReload(resp http.ResponseWriter, req *http.Request) (i
 		return nil, acl.ErrPermissionDenied
 	}
 
-	// Trigger the reload
+	return nil, s.agent.ReloadConfig()
-	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) api.AgentService {

agent/agent_endpoint_test.go

@@ -501,7 +501,7 @@ func TestAgent_Service(t *testing.T) {
 			updateFunc: func() {
 				time.Sleep(100 * time.Millisecond)
 				// Reload
-				require.NoError(t, a.ReloadConfig(a.Config))
+				require.NoError(t, a.reloadConfigInternal(a.Config))
 			},
 			// Should eventually timeout since there is no actual change
 			wantWait: 200 * time.Millisecond,
@@ -519,7 +519,7 @@ func TestAgent_Service(t *testing.T) {
 				// Reload
 				newConfig := *a.Config
 				newConfig.Services = append(newConfig.Services, &updatedProxy)
-				require.NoError(t, a.ReloadConfig(&newConfig))
+				require.NoError(t, a.reloadConfigInternal(&newConfig))
 			},
 			wantWait: 100 * time.Millisecond,
 			wantCode: 200,
@@ -1352,7 +1352,7 @@ func TestAgent_Reload(t *testing.T) {
 		`,
 	})
 
-	if err := a.ReloadConfig(cfg2); err != nil {
+	if err := a.reloadConfigInternal(cfg2); err != nil {
 		t.Fatalf("got error %v want nil", err)
 	}
 	if a.State.Service(structs.NewServiceID("redis-reloaded", nil)) == nil {
@@ -1505,7 +1505,7 @@ func TestAgent_ReloadDoesNotTriggerWatch(t *testing.T) {
 		// We check that reload does not go to critical
 		ensureNothingCritical(r, "red-is-dead")
 
-		if err := a.ReloadConfig(cfg2); err != nil {
+		if err := a.reloadConfigInternal(cfg2); err != nil {
 			t.Fatalf("got error %v want nil", err)
 		}
 
@@ -5194,7 +5194,11 @@ func TestAgentConnectCALeafCert_good(t *testing.T) {
 
 	assert := assert.New(t)
 	require := require.New(t)
-	a := NewTestAgent(t, "")
+	a := StartTestAgent(t, TestAgent{Overrides: `
+		connect {
+			test_ca_leaf_root_change_spread = "1ns"
+		}
+	`})
 	defer a.Shutdown()
 	testrpc.WaitForTestAgent(t, a.RPC, "dc1")
 	testrpc.WaitForActiveCARoot(t, a.RPC, "dc1", nil)
@@ -5297,7 +5301,11 @@ func TestAgentConnectCALeafCert_goodNotLocal(t *testing.T) {
 
 	assert := assert.New(t)
 	require := require.New(t)
-	a := NewTestAgent(t, "")
+	a := StartTestAgent(t, TestAgent{Overrides: `
+		connect {
+			test_ca_leaf_root_change_spread = "1ns"
+		}
+	`})
 	defer a.Shutdown()
 	testrpc.WaitForTestAgent(t, a.RPC, "dc1")
 	testrpc.WaitForActiveCARoot(t, a.RPC, "dc1", nil)
@@ -5421,6 +5429,10 @@ func TestAgentConnectCALeafCert_secondaryDC_good(t *testing.T) {
 	a1 := StartTestAgent(t, TestAgent{Name: "dc1", HCL: `
 		datacenter = "dc1"
 		primary_datacenter = "dc1"
+	`, Overrides: `
+		connect {
+			test_ca_leaf_root_change_spread = "1ns"
+		}
 	`})
 	defer a1.Shutdown()
 	testrpc.WaitForTestAgent(t, a1.RPC, "dc1")
@@ -5428,6 +5440,10 @@ func TestAgentConnectCALeafCert_secondaryDC_good(t *testing.T) {
 	a2 := StartTestAgent(t, TestAgent{Name: "dc2", HCL: `
 		datacenter = "dc2"
 		primary_datacenter = "dc1"
+	`, Overrides: `
+		connect {
+			test_ca_leaf_root_change_spread = "1ns"
+		}
 	`})
 	defer a2.Shutdown()
 	testrpc.WaitForTestAgent(t, a2.RPC, "dc2")

agent/agent_test.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"context"
 	"crypto/tls"
+	"encoding/base64"
 	"encoding/json"
 	"fmt"
 	"io/ioutil"
@@ -26,6 +27,7 @@ import (
 	"github.com/hashicorp/consul/agent/connect"
 	"github.com/hashicorp/consul/agent/structs"
 	"github.com/hashicorp/consul/api"
+	"github.com/hashicorp/consul/internal/go-sso/oidcauth/oidcauthtest"
 	"github.com/hashicorp/consul/ipaddr"
 	"github.com/hashicorp/consul/sdk/freeport"
 	"github.com/hashicorp/consul/sdk/testutil"
@@ -36,6 +38,7 @@ import (
 	"github.com/hashicorp/serf/serf"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
+	"gopkg.in/square/go-jose.v2/jwt"
 )
 
 func getService(a *TestAgent, id string) *structs.NodeService {
@@ -338,7 +341,7 @@ func TestAgent_makeNodeID(t *testing.T) {
 
 	// Turn on host-based IDs and try again. We should get the same ID
 	// each time (and a different one from the random one above).
-	a.Config.DisableHostNodeID = false
+	a.GetConfig().DisableHostNodeID = false
 	id, err = a.makeNodeID()
 	if err != nil {
 		t.Fatalf("err: %v", err)
@@ -2830,10 +2833,10 @@ func TestAgent_Service_MaintenanceMode(t *testing.T) {
 
 func TestAgent_Service_Reap(t *testing.T) {
 	// t.Parallel() // timing test. no parallel
-	a := NewTestAgent(t, `
+	a := StartTestAgent(t, TestAgent{Overrides: `
 		check_reap_interval = "50ms"
 		check_deregister_interval_min = "0s"
-	`)
+	`})
 	defer a.Shutdown()
 	testrpc.WaitForTestAgent(t, a.RPC, "dc1")
 
@@ -2885,10 +2888,10 @@ func TestAgent_Service_Reap(t *testing.T) {
 
 func TestAgent_Service_NoReap(t *testing.T) {
 	// t.Parallel() // timing test. no parallel
-	a := NewTestAgent(t, `
+	a := StartTestAgent(t, TestAgent{Overrides: `
 		check_reap_interval = "50ms"
 		check_deregister_interval_min = "0s"
-	`)
+	`})
 	defer a.Shutdown()
 
 	svc := &structs.NodeService{
@@ -3574,7 +3577,7 @@ func TestAgent_ReloadConfigOutgoingRPCConfig(t *testing.T) {
 		verify_server_hostname = true
 	`
 	c := TestConfig(testutil.Logger(t), config.Source{Name: t.Name(), Format: "hcl", Data: hcl})
-	require.NoError(t, a.ReloadConfig(c))
+	require.NoError(t, a.reloadConfigInternal(c))
 	tlsConf = a.tlsConfigurator.OutgoingRPCConfig()
 	require.False(t, tlsConf.InsecureSkipVerify)
 	require.Len(t, tlsConf.RootCAs.Subjects(), 2)
@@ -3604,7 +3607,7 @@ func TestAgent_ReloadConfigAndKeepChecksStatus(t *testing.T) {
 	}
 
 	c := TestConfig(testutil.Logger(t), config.Source{Name: t.Name(), Format: "hcl", Data: hcl})
-	require.NoError(t, a.ReloadConfig(c))
+	require.NoError(t, a.reloadConfigInternal(c))
 	// After reload, should be passing directly (no critical state)
 	for id, check := range a.State.Checks(nil) {
 		require.Equal(t, "passing", check.Status, "check %q is wrong", id)
@@ -3643,7 +3646,7 @@ func TestAgent_ReloadConfigIncomingRPCConfig(t *testing.T) {
 		verify_server_hostname = true
 	`
 	c := TestConfig(testutil.Logger(t), config.Source{Name: t.Name(), Format: "hcl", Data: hcl})
-	require.NoError(t, a.ReloadConfig(c))
+	require.NoError(t, a.reloadConfigInternal(c))
 	tlsConf, err = tlsConf.GetConfigForClient(nil)
 	require.NoError(t, err)
 	require.False(t, tlsConf.InsecureSkipVerify)
@@ -3672,7 +3675,7 @@ func TestAgent_ReloadConfigTLSConfigFailure(t *testing.T) {
 		verify_incoming = true
 	`
 	c := TestConfig(testutil.Logger(t), config.Source{Name: t.Name(), Format: "hcl", Data: hcl})
-	require.Error(t, a.ReloadConfig(c))
+	require.Error(t, a.reloadConfigInternal(c))
 	tlsConf, err := tlsConf.GetConfigForClient(nil)
 	require.NoError(t, err)
 	require.Equal(t, tls.NoClientCert, tlsConf.ClientAuth)
@@ -4546,3 +4549,109 @@ func TestAgent_JoinWAN_viaMeshGateway(t *testing.T) {
 		}
 	}
 }
+
+func TestAutoConfig_Integration(t *testing.T) {
+	// eventually this test should really live with integration tests
+	// the goal here is to have one test server and another test client
+	// spin up both agents and allow the server to authorize the auto config
+	// request and then see the client joined
+
+	cfgDir := testutil.TempDir(t, "auto-config")
+
+	// write some test TLS certificates out to the cfg dir
+	cert, key, cacert, err := testTLSCertificates("server.dc1.consul")
+	require.NoError(t, err)
+
+	certFile := filepath.Join(cfgDir, "cert.pem")
+	caFile := filepath.Join(cfgDir, "cacert.pem")
+	keyFile := filepath.Join(cfgDir, "key.pem")
+
+	require.NoError(t, ioutil.WriteFile(certFile, []byte(cert), 0600))
+	require.NoError(t, ioutil.WriteFile(caFile, []byte(cacert), 0600))
+	require.NoError(t, ioutil.WriteFile(keyFile, []byte(key), 0600))
+
+	// generate a gossip key
+	gossipKey := make([]byte, 32)
+	n, err := rand.Read(gossipKey)
+	require.NoError(t, err)
+	require.Equal(t, 32, n)
+	gossipKeyEncoded := base64.StdEncoding.EncodeToString(gossipKey)
+
+	// generate the JWT signing keys
+	pub, priv, err := oidcauthtest.GenerateKey()
+	require.NoError(t, err)
+
+	hclConfig := TestACLConfigWithParams(nil) + `
+		encrypt = "` + gossipKeyEncoded + `"
+		encrypt_verify_incoming = true
+		encrypt_verify_outgoing = true
+		verify_incoming = true
+		verify_outgoing = true
+		verify_server_hostname = true
+		ca_file = "` + caFile + `"
+		cert_file = "` + certFile + `"
+		key_file = "` + keyFile + `"
+		connect { enabled = true }
+		auto_encrypt { allow_tls = true }
+		auto_config {
+			authorizer {
+				enabled = true
+				claim_mappings = {
+					consul_node_name = "node"
+				}
+				claim_assertions = [
+					"value.node == \"${node}\""
+				]
+				bound_issuer = "consul"
+				bound_audiences = [
+					"consul"
+				]
+				jwt_validation_pub_keys = ["` + strings.ReplaceAll(pub, "\n", "\\n") + `"]
+			}
+		}
+	`
+
+	srv := StartTestAgent(t, TestAgent{Name: "TestAgent-Server", HCL: hclConfig})
+	defer srv.Shutdown()
+
+	testrpc.WaitForTestAgent(t, srv.RPC, "dc1", testrpc.WithToken(TestDefaultMasterToken))
+
+	// sign a JWT token
+	now := time.Now()
+	token, err := oidcauthtest.SignJWT(priv, jwt.Claims{
+		Subject:   "consul",
+		Issuer:    "consul",
+		Audience:  jwt.Audience{"consul"},
+		NotBefore: jwt.NewNumericDate(now.Add(-1 * time.Second)),
+		Expiry:    jwt.NewNumericDate(now.Add(5 * time.Minute)),
+	}, map[string]interface{}{
+		"consul_node_name": "test-client",
+	})
+	require.NoError(t, err)
+
+	client := StartTestAgent(t, TestAgent{Name: "test-client", HCL: TestACLConfigWithParams(nil) + `
+	   bootstrap = false
+		server = false
+		ca_file = "` + caFile + `"
+		verify_outgoing = true
+		verify_server_hostname = true
+		node_name = "test-client"
+		ports {
+			server = ` + strconv.Itoa(srv.Config.RPCBindAddr.Port) + `
+		}
+		auto_config {
+			enabled = true
+			intro_token = "` + token + `"
+			server_addresses = ["` + srv.Config.RPCBindAddr.String() + `"]
+		}`})
+
+	defer client.Shutdown()
+
+	// when this is successful we managed to get the gossip key and serf addresses to bind to
+	// and then connect. Additionally we would have to have certificates or else the
+	// verify_incoming config on the server would not let it work.
+	testrpc.WaitForTestAgent(t, client.RPC, "dc1", testrpc.WithToken(TestDefaultMasterToken))
+
+	// spot check that we now have an ACL token
+	require.NotEmpty(t, client.tokens.AgentToken())
+}

agent/auto-config/auto_config.go

@@ -0,0 +1,480 @@
+package autoconf
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"net"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/hashicorp/consul/agent/agentpb"
+	"github.com/hashicorp/consul/agent/config"
+	"github.com/hashicorp/consul/lib"
+	"github.com/hashicorp/consul/logging"
+	"github.com/hashicorp/consul/tlsutil"
+	"github.com/hashicorp/go-discover"
+	discoverk8s "github.com/hashicorp/go-discover/provider/k8s"
+	"github.com/hashicorp/go-hclog"
+)
+
+const (
+	// autoConfigFileName is the name of the file that the agent auto-config settings are
+	// stored in within the data directory
+	autoConfigFileName = "auto-config.json"
+)
+
+// DirectRPC is the interface that needs to be satisifed for AutoConfig to be able to perform
+// direct RPCs against individual servers. This should not use
+type DirectRPC interface {
+	RPC(dc string, node string, addr net.Addr, method string, args interface{}, reply interface{}) error
+}
+
+type options struct {
+	logger          hclog.Logger
+	directRPC       DirectRPC
+	tlsConfigurator *tlsutil.Configurator
+	builderOpts     config.BuilderOpts
+	waiter          *lib.RetryWaiter
+	overrides       []config.Source
+}
+
+// Option represents one point of configurability for the New function
+// when creating a new AutoConfig object
+type Option func(*options)
+
+// WithLogger will cause the created AutoConfig type to use the provided logger
+func WithLogger(logger hclog.Logger) Option {
+	return func(opt *options) {
+		opt.logger = logger
+	}
+}
+
+// WithTLSConfigurator will cause the created AutoConfig type to use the provided configurator
+func WithTLSConfigurator(tlsConfigurator *tlsutil.Configurator) Option {
+	return func(opt *options) {
+		opt.tlsConfigurator = tlsConfigurator
+	}
+}
+
+// WithConnectionPool will cause the created AutoConfig type to use the provided connection pool
+func WithDirectRPC(directRPC DirectRPC) Option {
+	return func(opt *options) {
+		opt.directRPC = directRPC
+	}
+}
+
+// WithBuilderOpts will cause the created AutoConfig type to use the provided CLI builderOpts
+func WithBuilderOpts(builderOpts config.BuilderOpts) Option {
+	return func(opt *options) {
+		opt.builderOpts = builderOpts
+	}
+}
+
+// WithRetryWaiter will cause the created AutoConfig type to use the provided retry waiter
+func WithRetryWaiter(waiter *lib.RetryWaiter) Option {
+	return func(opt *options) {
+		opt.waiter = waiter
+	}
+}
+
+// WithOverrides is used to provide a config source to append to the tail sources
+// during config building. It is really only useful for testing to tune non-user
+// configurable tunables to make various tests converge more quickly than they
+// could otherwise.
+func WithOverrides(overrides ...config.Source) Option {
+	return func(opt *options) {
+		opt.overrides = overrides
+	}
+}
+
+// AutoConfig is all the state necessary for being able to parse a configuration
+// as well as perform the necessary RPCs to perform Agent Auto Configuration.
+//
+// NOTE: This struct and methods on it are not currently thread/goroutine safe.
+// However it doesn't spawn any of its own go routines yet and is used in a
+// synchronous fashion. In the future if either of those two conditions change
+// then we will need to add some locking here. I am deferring that for now
+// to help ease the review of this already large PR.
+type AutoConfig struct {
+	config          *config.RuntimeConfig
+	builderOpts     config.BuilderOpts
+	logger          hclog.Logger
+	directRPC       DirectRPC
+	tlsConfigurator *tlsutil.Configurator
+	autoConfigData  string
+	waiter          *lib.RetryWaiter
+	overrides       []config.Source
+}
+
+func flattenOptions(opts []Option) options {
+	var flat options
+	for _, opt := range opts {
+		opt(&flat)
+	}
+	return flat
+}
+
+// New creates a new AutoConfig object for providing automatic
+// Consul configuration.
+func New(options ...Option) (*AutoConfig, error) {
+	flat := flattenOptions(options)
+
+	if flat.directRPC == nil {
+		return nil, fmt.Errorf("must provide a direct RPC delegate")
+	}
+
+	if flat.tlsConfigurator == nil {
+		return nil, fmt.Errorf("must provide a TLS configurator")
+	}
+
+	logger := flat.logger
+	if logger == nil {
+		logger = hclog.NewNullLogger()
+	} else {
+		logger = logger.Named(logging.AutoConfig)
+	}
+
+	waiter := flat.waiter
+	if waiter == nil {
+		waiter = lib.NewRetryWaiter(1, 0, 10*time.Minute, lib.NewJitterRandomStagger(25))
+	}
+
+	ac := &AutoConfig{
+		builderOpts:     flat.builderOpts,
+		logger:          logger,
+		directRPC:       flat.directRPC,
+		tlsConfigurator: flat.tlsConfigurator,
+		waiter:          waiter,
+		overrides:       flat.overrides,
+	}
+
+	return ac, nil
+}
+
+// LoadConfig will build the configuration including the extraHead source injected
+// after all other defaults but before any user supplied configuration and the overrides
+// source injected as the final source in the configuration parsing chain.
+func LoadConfig(builderOpts config.BuilderOpts, extraHead config.Source, overrides ...config.Source) (*config.RuntimeConfig, []string, error) {
+	b, err := config.NewBuilder(builderOpts)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	if extraHead.Data != "" {
+		b.Head = append(b.Head, extraHead)
+	}
+
+	if len(overrides) != 0 {
+		b.Tail = append(b.Tail, overrides...)
+	}
+
+	cfg, err := b.BuildAndValidate()
+	if err != nil {
+		return nil, nil, err
+	}
+
+	return &cfg, b.Warnings, nil
+}
+
+// ReadConfig will parse the current configuration and inject any
+// auto-config sources if present into the correct place in the parsing chain.
+func (ac *AutoConfig) ReadConfig() (*config.RuntimeConfig, error) {
+	src := config.Source{
+		Name:   autoConfigFileName,
+		Format: "json",
+		Data:   ac.autoConfigData,
+	}
+
+	cfg, warnings, err := LoadConfig(ac.builderOpts, src, ac.overrides...)
+	if err != nil {
+		return cfg, err
+	}
+
+	for _, w := range warnings {
+		ac.logger.Warn(w)
+	}
+
+	ac.config = cfg
+	return cfg, nil
+}
+
+// restorePersistedAutoConfig will attempt to load the persisted auto-config
+// settings from the data directory. It returns true either when there was an
+// unrecoverable error or when the configuration was successfully loaded from
+// disk. Recoverable errors, such as "file not found" are suppressed and this
+// method will return false for the first boolean.
+func (ac *AutoConfig) restorePersistedAutoConfig() (bool, error) {
+	if ac.config.DataDir == "" {
+		// no data directory means we don't have anything to potentially load
+		return false, nil
+	}
+
+	path := filepath.Join(ac.config.DataDir, autoConfigFileName)
+	ac.logger.Debug("attempting to restore any persisted configuration", "path", path)
+
+	content, err := ioutil.ReadFile(path)
+	if err == nil {
+		ac.logger.Info("restored persisted configuration", "path", path)
+		ac.autoConfigData = string(content)
+		return true, nil
+	}
+
+	if !os.IsNotExist(err) {
+		return true, fmt.Errorf("failed to load %s: %w", path, err)
+	}
+
+	// ignore non-existence errors as that is an indicator that we haven't
+	// performed the auto configuration before
+	return false, nil
+}
+
+// InitialConfiguration will perform a one-time RPC request to the configured servers
+// to retrieve various cluster wide configurations. See the agent/agentpb/auto_config.proto
+// file for a complete reference of what configurations can be applied in this manner.
+// The returned configuration will be the new configuration with any auto-config settings
+// already applied. If AutoConfig is not enabled this method will just parse any
+// local configuration and return the built runtime configuration.
+//
+// The context passed in can be used to cancel the retrieval of the initial configuration
+// like when receiving a signal during startup.
+func (ac *AutoConfig) InitialConfiguration(ctx context.Context) (*config.RuntimeConfig, error) {
+	if ac.config == nil {
+		config, err := ac.ReadConfig()
+		if err != nil {
+			return nil, err
+		}
+
+		ac.config = config
+	}
+
+	if !ac.config.AutoConfig.Enabled {
+		return ac.config, nil
+	}
+
+	ready, err := ac.restorePersistedAutoConfig()
+	if err != nil {
+		return nil, err
+	}
+
+	if !ready {
+		if err := ac.getInitialConfiguration(ctx); err != nil {
+			return nil, err
+		}
+	}
+
+	// re-read the configuration now that we have our initial auto-config
+	config, err := ac.ReadConfig()
+	if err != nil {
+		return nil, err
+	}
+
+	ac.config = config
+	return ac.config, nil
+}
+
+// introToken is responsible for determining the correct intro token to use
+// when making the initial Cluster.AutoConfig RPC request.
+func (ac *AutoConfig) introToken() (string, error) {
+	conf := ac.config.AutoConfig
+	// without an intro token or intro token file we cannot do anything
+	if conf.IntroToken == "" && conf.IntroTokenFile == "" {
+		return "", fmt.Errorf("neither intro_token or intro_token_file settings are not configured")
+	}
+
+	token := conf.IntroToken
+	if token == "" {
+		// load the intro token from the file
+		content, err := ioutil.ReadFile(conf.IntroTokenFile)
+		if err != nil {
+			return "", fmt.Errorf("Failed to read intro token from file: %w", err)
+		}
+
+		token = string(content)
+
+		if token == "" {
+			return "", fmt.Errorf("intro_token_file did not contain any token")
+		}
+	}
+
+	return token, nil
+}
+
+// autoConfigHosts is responsible for taking the list of server addresses and
+// resolving any go-discover provider invocations. It will then return a list
+// of hosts. These might be hostnames and is expected that DNS resolution may
+// be performed after this function runs. Additionally these may contain ports
+// so SplitHostPort could also be necessary.
+func (ac *AutoConfig) autoConfigHosts() ([]string, error) {
+	servers := ac.config.AutoConfig.ServerAddresses
+
+	providers := make(map[string]discover.Provider)
+	for k, v := range discover.Providers {
+		providers[k] = v
+	}
+	providers["k8s"] = &discoverk8s.Provider{}
+
+	disco, err := discover.New(
+		discover.WithUserAgent(lib.UserAgent()),
+		discover.WithProviders(providers),
+	)
+
+	if err != nil {
+		return nil, fmt.Errorf("Failed to create go-discover resolver: %w", err)
+	}
+
+	var addrs []string
+	for _, addr := range servers {
+		switch {
+		case strings.Contains(addr, "provider="):
+			resolved, err := disco.Addrs(addr, ac.logger.StandardLogger(&hclog.StandardLoggerOptions{InferLevels: true}))
+			if err != nil {
+				ac.logger.Error("failed to resolve go-discover auto-config servers", "configuration", addr, "err", err)
+				continue
+			}
+
+			addrs = append(addrs, resolved...)
+			ac.logger.Debug("discovered auto-config servers", "servers", resolved)
+		default:
+			addrs = append(addrs, addr)
+		}
+	}
+
+	if len(addrs) == 0 {
+		return nil, fmt.Errorf("no auto-config server addresses available for use")
+	}
+
+	return addrs, nil
+}
+
+// resolveHost will take a single host string and convert it to a list of TCPAddrs
+// This will process any port in the input as well as looking up the hostname using
+// normal DNS resolution.
+func (ac *AutoConfig) resolveHost(hostPort string) []net.TCPAddr {
+	port := ac.config.ServerPort
+	host, portStr, err := net.SplitHostPort(hostPort)
+	if err != nil {
+		if strings.Contains(err.Error(), "missing port in address") {
+			host = hostPort
+		} else {
+			ac.logger.Warn("error splitting host address into IP and port", "address", hostPort, "error", err)
+			return nil
+		}
+	} else {
+		port, err = strconv.Atoi(portStr)
+		if err != nil {
+			ac.logger.Warn("Parsed port is not an integer", "port", portStr, "error", err)
+			return nil
+		}
+	}
+
+	// resolve the host to a list of IPs
+	ips, err := net.LookupIP(host)
+	if err != nil {
+		ac.logger.Warn("IP resolution failed", "host", host, "error", err)
+		return nil
+	}
+
+	var addrs []net.TCPAddr
+	for _, ip := range ips {
+		addrs = append(addrs, net.TCPAddr{IP: ip, Port: port})
+	}
+
+	return addrs
+}
+
+// recordAutoConfigReply takes an AutoConfig RPC reply records it with the agent
+// This will persist the configuration to disk (unless in dev mode running without
+// a data dir) and will reload the configuration.
+func (ac *AutoConfig) recordAutoConfigReply(reply *agentpb.AutoConfigResponse) error {
+	conf, err := json.Marshal(translateConfig(reply.Config))
+	if err != nil {
+		return fmt.Errorf("failed to encode auto-config configuration as JSON: %w", err)
+	}
+
+	ac.autoConfigData = string(conf)
+
+	if ac.config.DataDir == "" {
+		ac.logger.Debug("not persisting auto-config settings because there is no data directory")
+		return nil
+	}
+
+	path := filepath.Join(ac.config.DataDir, autoConfigFileName)
+
+	err = ioutil.WriteFile(path, conf, 0660)
+	if err != nil {
+		return fmt.Errorf("failed to write auto-config configurations: %w", err)
+	}
+
+	ac.logger.Debug("auto-config settings were persisted to disk")
+
+	return nil
+}
+
+// getInitialConfigurationOnce will perform full server to TCPAddr resolution and
+// loop through each host trying to make the Cluster.AutoConfig RPC call. When
+// successful the bool return will be true and the err value will indicate whether we
+// successfully recorded the auto config settings (persisted to disk and stored internally
+// on the AutoConfig object)
+func (ac *AutoConfig) getInitialConfigurationOnce(ctx context.Context) (bool, error) {
+	token, err := ac.introToken()
+	if err != nil {
+		return false, err
+	}
+
+	request := agentpb.AutoConfigRequest{
+		Datacenter: ac.config.Datacenter,
+		Node:       ac.config.NodeName,
+		Segment:    ac.config.SegmentName,
+		JWT:        token,
+	}
+
+	var reply agentpb.AutoConfigResponse
+
+	servers, err := ac.autoConfigHosts()
+	if err != nil {
+		return false, err
+	}
+
+	for _, s := range servers {
+		// try each IP to see if we can successfully make the request
+		for _, addr := range ac.resolveHost(s) {
+			if ctx.Err() != nil {
+				return false, ctx.Err()
+			}
+
+			ac.logger.Debug("Making Cluster.AutoConfig RPC", "addr", addr.String())
+			if err = ac.directRPC.RPC(ac.config.Datacenter, ac.config.NodeName, &addr, "Cluster.AutoConfig", &request, &reply); err != nil {
+				ac.logger.Error("AutoConfig RPC failed", "addr", addr.String(), "error", err)
+				continue
+			}
+
+			return true, ac.recordAutoConfigReply(&reply)
+		}
+	}
+
+	return false, nil
+}
+
+// getInitialConfiguration implements a loop to retry calls to getInitialConfigurationOnce.
+// It uses the RetryWaiter on the AutoConfig object to control how often to attempt
+// the initial configuration process. It is also canceallable by cancelling the provided context.
+func (ac *AutoConfig) getInitialConfiguration(ctx context.Context) error {
+	// this resets the failures so that we will perform immediate request
+	wait := ac.waiter.Success()
+	for {
+		select {
+		case <-wait:
+			if done, err := ac.getInitialConfigurationOnce(ctx); done {
+				return err
+			}
+			wait = ac.waiter.Failed()
+		case <-ctx.Done():
+			return ctx.Err()
+		}
+	}
+}

agent/auto-config/auto_config_test.go

@@ -0,0 +1,397 @@
+package autoconf
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"net"
+	"os"
+	"path/filepath"
+	"testing"
+	"time"
+
+	"github.com/hashicorp/consul/agent/agentpb"
+	pbconfig "github.com/hashicorp/consul/agent/agentpb/config"
+	"github.com/hashicorp/consul/agent/config"
+	"github.com/hashicorp/consul/lib"
+	"github.com/hashicorp/consul/sdk/testutil"
+	"github.com/hashicorp/consul/tlsutil"
+	"github.com/stretchr/testify/mock"
+	"github.com/stretchr/testify/require"
+)
+
+type mockDirectRPC struct {
+	mock.Mock
+}
+
+func (m *mockDirectRPC) RPC(dc string, node string, addr net.Addr, method string, args interface{}, reply interface{}) error {
+	retValues := m.Called(dc, node, addr, method, args, reply)
+	switch ret := retValues.Get(0).(type) {
+	case error:
+		return ret
+	case func(interface{}):
+		ret(reply)
+		return nil
+	default:
+		return fmt.Errorf("This should not happen, update mock direct rpc expectations")
+	}
+}
+
+func TestNew(t *testing.T) {
+	type testCase struct {
+		opts     []Option
+		err      string
+		validate func(t *testing.T, ac *AutoConfig)
+	}
+
+	cases := map[string]testCase{
+		"no-direct-rpc": {
+			opts: []Option{
+				WithTLSConfigurator(&tlsutil.Configurator{}),
+			},
+			err: "must provide a direct RPC delegate",
+		},
+		"no-tls-configurator": {
+			opts: []Option{
+				WithDirectRPC(&mockDirectRPC{}),
+			},
+			err: "must provide a TLS configurator",
+		},
+		"ok": {
+			opts: []Option{
+				WithTLSConfigurator(&tlsutil.Configurator{}),
+				WithDirectRPC(&mockDirectRPC{}),
+			},
+			validate: func(t *testing.T, ac *AutoConfig) {
+				t.Helper()
+				require.NotNil(t, ac.logger)
+			},
+		},
+	}
+
+	for name, tcase := range cases {
+		t.Run(name, func(t *testing.T) {
+			ac, err := New(tcase.opts...)
+			if tcase.err != "" {
+				testutil.RequireErrorContains(t, err, tcase.err)
+			} else {
+				require.NoError(t, err)
+				require.NotNil(t, ac)
+				if tcase.validate != nil {
+					tcase.validate(t, ac)
+				}
+			}
+		})
+	}
+}
+
+func TestLoadConfig(t *testing.T) {
+	// Basically just testing that injection of the extra
+	// source works.
+	devMode := true
+	builderOpts := config.BuilderOpts{
+		// putting this in dev mode so that the config validates
+		// without having to specify a data directory
+		DevMode: &devMode,
+	}
+
+	cfg, warnings, err := LoadConfig(builderOpts, config.Source{
+		Name:   "test",
+		Format: "hcl",
+		Data:   `node_name = "hobbiton"`,
+	},
+		config.Source{
+			Name:   "overrides",
+			Format: "json",
+			Data:   `{"check_reap_interval": "1ms"}`,
+		})
+
+	require.NoError(t, err)
+	require.Empty(t, warnings)
+	require.NotNil(t, cfg)
+	require.Equal(t, "hobbiton", cfg.NodeName)
+	require.Equal(t, 1*time.Millisecond, cfg.CheckReapInterval)
+}
+
+func TestReadConfig(t *testing.T) {
+	// just testing that some auto config source gets injected
+	devMode := true
+	ac := AutoConfig{
+		autoConfigData: `{"node_name": "hobbiton"}`,
+		builderOpts: config.BuilderOpts{
+			// putting this in dev mode so that the config validates
+			// without having to specify a data directory
+			DevMode: &devMode,
+		},
+		logger: testutil.Logger(t),
+	}
+
+	cfg, err := ac.ReadConfig()
+	require.NoError(t, err)
+	require.NotNil(t, cfg)
+	require.Equal(t, "hobbiton", cfg.NodeName)
+	require.Same(t, ac.config, cfg)
+}
+
+func testSetupAutoConf(t *testing.T) (string, string, config.BuilderOpts) {
+	t.Helper()
+
+	// create top level directory to hold both config and data
+	tld := testutil.TempDir(t, "auto-config")
+	t.Cleanup(func() { os.RemoveAll(tld) })
+
+	// create the data directory
+	dataDir := filepath.Join(tld, "data")
+	require.NoError(t, os.Mkdir(dataDir, 0700))
+
+	// create the config directory
+	configDir := filepath.Join(tld, "config")
+	require.NoError(t, os.Mkdir(configDir, 0700))
+
+	builderOpts := config.BuilderOpts{
+		HCL: []string{
+			`data_dir = "` + dataDir + `"`,
+			`datacenter = "dc1"`,
+			`node_name = "autoconf"`,
+			`bind_addr = "127.0.0.1"`,
+		},
+	}
+
+	return dataDir, configDir, builderOpts
+}
+
+func TestInitialConfiguration_disabled(t *testing.T) {
+	dataDir, configDir, builderOpts := testSetupAutoConf(t)
+
+	cfgFile := filepath.Join(configDir, "test.json")
+	require.NoError(t, ioutil.WriteFile(cfgFile, []byte(`{
+		"primary_datacenter": "primary", 
+		"auto_config": {"enabled": false}
+	}`), 0600))
+
+	builderOpts.ConfigFiles = append(builderOpts.ConfigFiles, cfgFile)
+
+	directRPC := mockDirectRPC{}
+	ac, err := New(WithBuilderOpts(builderOpts), WithTLSConfigurator(&tlsutil.Configurator{}), WithDirectRPC(&directRPC))
+	require.NoError(t, err)
+	require.NotNil(t, ac)
+
+	cfg, err := ac.InitialConfiguration(context.Background())
+	require.NoError(t, err)
+	require.NotNil(t, cfg)
+	require.Equal(t, "primary", cfg.PrimaryDatacenter)
+	require.NoFileExists(t, filepath.Join(dataDir, autoConfigFileName))
+
+	// ensure no RPC was made
+	directRPC.AssertExpectations(t)
+}
+
+func TestInitialConfiguration_cancelled(t *testing.T) {
+	_, configDir, builderOpts := testSetupAutoConf(t)
+
+	cfgFile := filepath.Join(configDir, "test.json")
+	require.NoError(t, ioutil.WriteFile(cfgFile, []byte(`{
+		"primary_datacenter": "primary", 
+		"auto_config": {"enabled": true, "intro_token": "blarg", "server_addresses": ["127.0.0.1:8300"]}
+	}`), 0600))
+
+	builderOpts.ConfigFiles = append(builderOpts.ConfigFiles, cfgFile)
+
+	directRPC := mockDirectRPC{}
+
+	expectedRequest := agentpb.AutoConfigRequest{
+		Datacenter: "dc1",
+		Node:       "autoconf",
+		JWT:        "blarg",
+	}
+
+	directRPC.On("RPC", "dc1", "autoconf", &net.TCPAddr{IP: net.IPv4(127, 0, 0, 1), Port: 8300}, "Cluster.AutoConfig", &expectedRequest, mock.Anything).Return(fmt.Errorf("injected error")).Times(0)
+	ac, err := New(WithBuilderOpts(builderOpts), WithTLSConfigurator(&tlsutil.Configurator{}), WithDirectRPC(&directRPC))
+	require.NoError(t, err)
+	require.NotNil(t, ac)
+
+	ctx, cancelFn := context.WithDeadline(context.Background(), time.Now().Add(100*time.Millisecond))
+	defer cancelFn()
+
+	cfg, err := ac.InitialConfiguration(ctx)
+	testutil.RequireErrorContains(t, err, context.DeadlineExceeded.Error())
+	require.Nil(t, cfg)
+
+	// ensure no RPC was made
+	directRPC.AssertExpectations(t)
+}
+
+func TestInitialConfiguration_restored(t *testing.T) {
+	dataDir, configDir, builderOpts := testSetupAutoConf(t)
+
+	cfgFile := filepath.Join(configDir, "test.json")
+	require.NoError(t, ioutil.WriteFile(cfgFile, []byte(`{
+		"auto_config": {"enabled": true, "intro_token": "blarg", "server_addresses": ["127.0.0.1:8300"]}
+	}`), 0600))
+
+	builderOpts.ConfigFiles = append(builderOpts.ConfigFiles, cfgFile)
+
+	// persist an auto config response to the data dir where it is expected
+	persistedFile := filepath.Join(dataDir, autoConfigFileName)
+	response := &pbconfig.Config{
+		PrimaryDatacenter: "primary",
+	}
+	data, err := json.Marshal(translateConfig(response))
+	require.NoError(t, err)
+	require.NoError(t, ioutil.WriteFile(persistedFile, data, 0600))
+
+	directRPC := mockDirectRPC{}
+
+	ac, err := New(WithBuilderOpts(builderOpts), WithTLSConfigurator(&tlsutil.Configurator{}), WithDirectRPC(&directRPC))
+	require.NoError(t, err)
+	require.NotNil(t, ac)
+
+	cfg, err := ac.InitialConfiguration(context.Background())
+	require.NoError(t, err)
+	require.NotNil(t, cfg)
+	require.Equal(t, "primary", cfg.PrimaryDatacenter)
+
+	// ensure no RPC was made
+	directRPC.AssertExpectations(t)
+}
+
+func TestInitialConfiguration_success(t *testing.T) {
+	dataDir, configDir, builderOpts := testSetupAutoConf(t)
+
+	cfgFile := filepath.Join(configDir, "test.json")
+	require.NoError(t, ioutil.WriteFile(cfgFile, []byte(`{
+		"auto_config": {"enabled": true, "intro_token": "blarg", "server_addresses": ["127.0.0.1:8300"]}
+	}`), 0600))
+
+	builderOpts.ConfigFiles = append(builderOpts.ConfigFiles, cfgFile)
+
+	persistedFile := filepath.Join(dataDir, autoConfigFileName)
+	directRPC := mockDirectRPC{}
+
+	populateResponse := func(val interface{}) {
+		resp, ok := val.(*agentpb.AutoConfigResponse)
+		require.True(t, ok)
+		resp.Config = &pbconfig.Config{
+			PrimaryDatacenter: "primary",
+		}
+	}
+
+	expectedRequest := agentpb.AutoConfigRequest{
+		Datacenter: "dc1",
+		Node:       "autoconf",
+		JWT:        "blarg",
+	}
+
+	directRPC.On(
+		"RPC",
+		"dc1",
+		"autoconf",
+		&net.TCPAddr{IP: net.IPv4(127, 0, 0, 1), Port: 8300},
+		"Cluster.AutoConfig",
+		&expectedRequest,
+		&agentpb.AutoConfigResponse{}).Return(populateResponse)
+
+	ac, err := New(WithBuilderOpts(builderOpts), WithTLSConfigurator(&tlsutil.Configurator{}), WithDirectRPC(&directRPC))
+	require.NoError(t, err)
+	require.NotNil(t, ac)
+
+	cfg, err := ac.InitialConfiguration(context.Background())
+	require.NoError(t, err)
+	require.NotNil(t, cfg)
+	require.Equal(t, "primary", cfg.PrimaryDatacenter)
+
+	// the file was written to.
+	require.FileExists(t, persistedFile)
+
+	// ensure no RPC was made
+	directRPC.AssertExpectations(t)
+}
+
+func TestInitialConfiguration_retries(t *testing.T) {
+	dataDir, configDir, builderOpts := testSetupAutoConf(t)
+
+	cfgFile := filepath.Join(configDir, "test.json")
+	require.NoError(t, ioutil.WriteFile(cfgFile, []byte(`{
+		"auto_config": {"enabled": true, "intro_token": "blarg", "server_addresses": ["198.18.0.1", "198.18.0.2:8398", "198.18.0.3:8399", "127.0.0.1:1234"]}
+	}`), 0600))
+
+	builderOpts.ConfigFiles = append(builderOpts.ConfigFiles, cfgFile)
+
+	persistedFile := filepath.Join(dataDir, autoConfigFileName)
+	directRPC := mockDirectRPC{}
+
+	populateResponse := func(val interface{}) {
+		resp, ok := val.(*agentpb.AutoConfigResponse)
+		require.True(t, ok)
+		resp.Config = &pbconfig.Config{
+			PrimaryDatacenter: "primary",
+		}
+	}
+
+	expectedRequest := agentpb.AutoConfigRequest{
+		Datacenter: "dc1",
+		Node:       "autoconf",
+		JWT:        "blarg",
+	}
+
+	// basically the 198.18.0.* addresses should fail indefinitely. the first time through the
+	// outer loop we inject a failure for the DNS resolution of localhost to 127.0.0.1. Then
+	// the second time through the outer loop we allow the localhost one to work.
+	directRPC.On(
+		"RPC",
+		"dc1",
+		"autoconf",
+		&net.TCPAddr{IP: net.IPv4(198, 18, 0, 1), Port: 8300},
+		"Cluster.AutoConfig",
+		&expectedRequest,
+		&agentpb.AutoConfigResponse{}).Return(fmt.Errorf("injected failure")).Times(0)
+	directRPC.On(
+		"RPC",
+		"dc1",
+		"autoconf",
+		&net.TCPAddr{IP: net.IPv4(198, 18, 0, 2), Port: 8398},
+		"Cluster.AutoConfig",
+		&expectedRequest,
+		&agentpb.AutoConfigResponse{}).Return(fmt.Errorf("injected failure")).Times(0)
+	directRPC.On(
+		"RPC",
+		"dc1",
+		"autoconf",
+		&net.TCPAddr{IP: net.IPv4(198, 18, 0, 3), Port: 8399},
+		"Cluster.AutoConfig",
+		&expectedRequest,
+		&agentpb.AutoConfigResponse{}).Return(fmt.Errorf("injected failure")).Times(0)
+	directRPC.On(
+		"RPC",
+		"dc1",
+		"autoconf",
+		&net.TCPAddr{IP: net.IPv4(127, 0, 0, 1), Port: 1234},
+		"Cluster.AutoConfig",
+		&expectedRequest,
+		&agentpb.AutoConfigResponse{}).Return(fmt.Errorf("injected failure")).Once()
+	directRPC.On(
+		"RPC",
+		"dc1",
+		"autoconf",
+		&net.TCPAddr{IP: net.IPv4(127, 0, 0, 1), Port: 1234},
+		"Cluster.AutoConfig",
+		&expectedRequest,
+		&agentpb.AutoConfigResponse{}).Return(populateResponse)
+
+	waiter := lib.NewRetryWaiter(2, 0, 1*time.Millisecond, nil)
+	ac, err := New(WithBuilderOpts(builderOpts), WithTLSConfigurator(&tlsutil.Configurator{}), WithDirectRPC(&directRPC), WithRetryWaiter(waiter))
+	require.NoError(t, err)
+	require.NotNil(t, ac)
+
+	cfg, err := ac.InitialConfiguration(context.Background())
+	require.NoError(t, err)
+	require.NotNil(t, cfg)
+	require.Equal(t, "primary", cfg.PrimaryDatacenter)
+
+	// the file was written to.
+	require.FileExists(t, persistedFile)
+
+	// ensure no RPC was made
+	directRPC.AssertExpectations(t)
+}

agent/auto-config/config_translate.go

@@ -0,0 +1,93 @@
+package autoconf
+
+import (
+	pbconfig "github.com/hashicorp/consul/agent/agentpb/config"
+	"github.com/hashicorp/consul/agent/config"
+)
+
+// translateAgentConfig is meant to take in a agent/agentpb/config.Config type
+// and craft the corresponding agent/config.Config type. The need for this function
+// should eventually be removed with the protobuf and normal version converging.
+// In the meantime, its not desirable to have the flatter Config struct in protobufs
+// as in the long term we want a configuration with more nested groupings.
+//
+// Why is this function not in the agent/agentpb/config package? The answer, that
+// package cannot import the agent/config package without running into import cycles.
+func translateConfig(c *pbconfig.Config) *config.Config {
+	out := config.Config{
+		Datacenter:        &c.Datacenter,
+		PrimaryDatacenter: &c.PrimaryDatacenter,
+		NodeName:          &c.NodeName,
+		SegmentName:       &c.SegmentName,
+	}
+
+	// Translate Auto Encrypt settings
+	if a := c.AutoEncrypt; a != nil {
+		out.AutoEncrypt = config.AutoEncrypt{
+			TLS:      &a.TLS,
+			DNSSAN:   a.DNSSAN,
+			IPSAN:    a.IPSAN,
+			AllowTLS: &a.AllowTLS,
+		}
+	}
+
+	// Translate all the ACL settings
+	if a := c.ACL; a != nil {
+		out.ACL = config.ACL{
+			Enabled:                &a.Enabled,
+			PolicyTTL:              &a.PolicyTTL,
+			RoleTTL:                &a.RoleTTL,
+			TokenTTL:               &a.TokenTTL,
+			DownPolicy:             &a.DownPolicy,
+			DefaultPolicy:          &a.DefaultPolicy,
+			EnableKeyListPolicy:    &a.EnableKeyListPolicy,
+			DisabledTTL:            &a.DisabledTTL,
+			EnableTokenPersistence: &a.EnableTokenPersistence,
+			MSPDisableBootstrap:    &a.MSPDisableBootstrap,
+		}
+
+		if t := c.ACL.Tokens; t != nil {
+			var tokens []config.ServiceProviderToken
+
+			// create the slice of msp tokens if any
+			for _, mspToken := range t.ManagedServiceProvider {
+				tokens = append(tokens, config.ServiceProviderToken{
+					AccessorID: &mspToken.AccessorID,
+					SecretID:   &mspToken.SecretID,
+				})
+			}
+
+			out.ACL.Tokens = config.Tokens{
+				Master:                 &t.Master,
+				Replication:            &t.Replication,
+				AgentMaster:            &t.AgentMaster,
+				Default:                &t.Default,
+				Agent:                  &t.Agent,
+				ManagedServiceProvider: tokens,
+			}
+		}
+	}
+
+	// Translate the Gossip settings
+	if g := c.Gossip; g != nil {
+		out.RetryJoinLAN = g.RetryJoinLAN
+
+		// Translate the Gossip Encryption settings
+		if e := c.Gossip.Encryption; e != nil {
+			out.EncryptKey = &e.Key
+			out.EncryptVerifyIncoming = &e.VerifyIncoming
+			out.EncryptVerifyOutgoing = &e.VerifyOutgoing
+		}
+	}
+
+	// Translate the Generic TLS settings
+	if t := c.TLS; t != nil {
+		out.VerifyOutgoing = &t.VerifyOutgoing
+		out.VerifyServerHostname = &t.VerifyServerHostname
+		out.TLSMinVersion = &t.MinVersion
+		out.TLSCipherSuites = &t.CipherSuites
+		out.TLSPreferServerCipherSuites = &t.PreferServerCipherSuites
+	}
+
+	return &out
+}

agent/auto-config/config_translate_test.go

@@ -0,0 +1,122 @@
+package autoconf
+
+import (
+	"testing"
+
+	pbconfig "github.com/hashicorp/consul/agent/agentpb/config"
+	"github.com/hashicorp/consul/agent/config"
+	"github.com/stretchr/testify/require"
+)
+
+func stringPointer(s string) *string {
+	return &s
+}
+
+func boolPointer(b bool) *bool {
+	return &b
+}
+
+func TestConfig_translateConfig(t *testing.T) {
+	original := pbconfig.Config{
+		Datacenter:        "abc",
+		PrimaryDatacenter: "def",
+		NodeName:          "ghi",
+		SegmentName:       "jkl",
+		ACL: &pbconfig.ACL{
+			Enabled:                true,
+			PolicyTTL:              "1s",
+			RoleTTL:                "2s",
+			TokenTTL:               "3s",
+			DownPolicy:             "deny",
+			DefaultPolicy:          "deny",
+			EnableKeyListPolicy:    true,
+			DisabledTTL:            "4s",
+			EnableTokenPersistence: true,
+			MSPDisableBootstrap:    false,
+			Tokens: &pbconfig.ACLTokens{
+				Master:      "99e7e490-6baf-43fc-9010-78b6aa9a6813",
+				Replication: "51308d40-465c-4ac6-a636-7c0747edec89",
+				AgentMaster: "e012e1ea-78a2-41cc-bc8b-231a44196f39",
+				Default:     "8781a3f5-de46-4b45-83e1-c92f4cfd0332",
+				Agent:       "ddb8f1b0-8a99-4032-b601-87926bce244e",
+				ManagedServiceProvider: []*pbconfig.ACLServiceProviderToken{
+					{
+						AccessorID: "23f37987-7b9e-4e5b-acae-dbc9bc137bae",
+						SecretID:   "e28b820a-438e-4e2b-ad24-fe59e6a4914f",
+					},
+				},
+			},
+		},
+		AutoEncrypt: &pbconfig.AutoEncrypt{
+			TLS:      true,
+			DNSSAN:   []string{"dns"},
+			IPSAN:    []string{"198.18.0.1"},
+			AllowTLS: false,
+		},
+		Gossip: &pbconfig.Gossip{
+			RetryJoinLAN: []string{"10.0.0.1"},
+			Encryption: &pbconfig.GossipEncryption{
+				Key:            "blarg",
+				VerifyOutgoing: true,
+				VerifyIncoming: true,
+			},
+		},
+		TLS: &pbconfig.TLS{
+			VerifyOutgoing:           true,
+			VerifyServerHostname:     true,
+			CipherSuites:             "stuff",
+			MinVersion:               "tls13",
+			PreferServerCipherSuites: true,
+		},
+	}
+
+	expected := &config.Config{
+		Datacenter:                  stringPointer("abc"),
+		PrimaryDatacenter:           stringPointer("def"),
+		NodeName:                    stringPointer("ghi"),
+		SegmentName:                 stringPointer("jkl"),
+		RetryJoinLAN:                []string{"10.0.0.1"},
+		EncryptKey:                  stringPointer("blarg"),
+		EncryptVerifyIncoming:       boolPointer(true),
+		EncryptVerifyOutgoing:       boolPointer(true),
+		VerifyOutgoing:              boolPointer(true),
+		VerifyServerHostname:        boolPointer(true),
+		TLSCipherSuites:             stringPointer("stuff"),
+		TLSMinVersion:               stringPointer("tls13"),
+		TLSPreferServerCipherSuites: boolPointer(true),
+		ACL: config.ACL{
+			Enabled:                boolPointer(true),
+			PolicyTTL:              stringPointer("1s"),
+			RoleTTL:                stringPointer("2s"),
+			TokenTTL:               stringPointer("3s"),
+			DownPolicy:             stringPointer("deny"),
+			DefaultPolicy:          stringPointer("deny"),
+			EnableKeyListPolicy:    boolPointer(true),
+			DisabledTTL:            stringPointer("4s"),
+			EnableTokenPersistence: boolPointer(true),
+			MSPDisableBootstrap:    boolPointer(false),
+			Tokens: config.Tokens{
+				Master:      stringPointer("99e7e490-6baf-43fc-9010-78b6aa9a6813"),
+				Replication: stringPointer("51308d40-465c-4ac6-a636-7c0747edec89"),
+				AgentMaster: stringPointer("e012e1ea-78a2-41cc-bc8b-231a44196f39"),
+				Default:     stringPointer("8781a3f5-de46-4b45-83e1-c92f4cfd0332"),
+				Agent:       stringPointer("ddb8f1b0-8a99-4032-b601-87926bce244e"),
+				ManagedServiceProvider: []config.ServiceProviderToken{
+					{
+						AccessorID: stringPointer("23f37987-7b9e-4e5b-acae-dbc9bc137bae"),
+						SecretID:   stringPointer("e28b820a-438e-4e2b-ad24-fe59e6a4914f"),
+					},
+				},
+			},
+		},
+		AutoEncrypt: config.AutoEncrypt{
+			TLS:      boolPointer(true),
+			DNSSAN:   []string{"dns"},
+			IPSAN:    []string{"198.18.0.1"},
+			AllowTLS: boolPointer(false),
+		},
+	}
+
+	actual := translateConfig(&original)
+	require.Equal(t, expected, actual)
+}

agent/config/builder.go

@@ -906,6 +906,7 @@ func (b *Builder) Build() (rt RuntimeConfig, err error) {
 		ConnectMeshGatewayWANFederationEnabled: connectMeshGatewayWANFederationEnabled,
 		ConnectSidecarMinPort:                  sidecarMinPort,
 		ConnectSidecarMaxPort:                  sidecarMaxPort,
+		ConnectTestCALeafRootChangeSpread:      b.durationVal("connect.test_ca_leaf_root_change_spread", c.Connect.TestCALeafRootChangeSpread),
 		ExposeMinPort:                          exposeMinPort,
 		ExposeMaxPort:                          exposeMaxPort,
 		DataDir:                                b.stringVal(c.DataDir),

agent/config/config.go

@@ -513,6 +513,11 @@ type Connect struct {
 	CAProvider                      *string                `json:"ca_provider,omitempty" hcl:"ca_provider" mapstructure:"ca_provider"`
 	CAConfig                        map[string]interface{} `json:"ca_config,omitempty" hcl:"ca_config" mapstructure:"ca_config"`
 	MeshGatewayWANFederationEnabled *bool                  `json:"enable_mesh_gateway_wan_federation" hcl:"enable_mesh_gateway_wan_federation" mapstructure:"enable_mesh_gateway_wan_federation"`
+
+	// TestCALeafRootChangeSpread controls how long after a CA roots change before new leaft certs will be generated.
+	// This is only tuned in tests, generally set to 1ns to make tests deterministic with when to expect updated leaf
+	// certs by. This configuration is not exposed to users (not documented, and agent/config/default.go will override it)
+	TestCALeafRootChangeSpread *string `json:"test_ca_leaf_root_change_spread,omitempty" hcl:"test_ca_leaf_root_change_spread" mapstructure:"test_ca_leaf_root_change_spread"`
 }
 
 // SOA is the configuration of SOA for DNS

agent/config/default.go

@@ -190,6 +190,12 @@ func NonUserSource() Source {
 
 		# SegmentNameLimit is the maximum segment name length.
 		segment_name_limit = 64
+		
+		connect = { 
+			# 0s causes the value to be ignored and operate without capping
+			# the max time before leaf certs can be generated after a roots change.
+			test_ca_leaf_root_change_spread = "0s"
+		}
 	`,
 	}
 }

agent/consul/client.go

@@ -101,7 +101,13 @@ func NewClient(config *Config) (*Client, error) {
 	return NewClientLogger(config, nil, c)
 }
 
-func NewClientLogger(config *Config, logger hclog.InterceptLogger, tlsConfigurator *tlsutil.Configurator) (*Client, error) {
+func NewClientWithOptions(config *Config, options ...ConsulOption) (*Client, error) {
+	flat := flattenConsulOptions(options)
+
+	logger := flat.logger
+	tlsConfigurator := flat.tlsConfigurator
+	connPool := flat.connPool
+
 	// Check the protocol version
 	if err := config.CheckProtocolVersion(); err != nil {
 		return nil, err
@@ -130,7 +136,8 @@ func NewClientLogger(config *Config, logger hclog.InterceptLogger, tlsConfigurat
 		})
 	}
 
-	connPool := &pool.ConnPool{
+	if connPool == nil {
+		connPool = &pool.ConnPool{
 			Server:          false,
 			SrcAddr:         config.RPCSrcAddr,
 			LogOutput:       config.LogOutput,
@@ -139,6 +146,7 @@ func NewClientLogger(config *Config, logger hclog.InterceptLogger, tlsConfigurat
 			TLSConfigurator: tlsConfigurator,
 			Datacenter:      config.Datacenter,
 		}
+	}
 
 	// Create client
 	c := &Client{
@@ -202,6 +210,10 @@ func NewClientLogger(config *Config, logger hclog.InterceptLogger, tlsConfigurat
 	return c, nil
 }
 
+func NewClientLogger(config *Config, logger hclog.InterceptLogger, tlsConfigurator *tlsutil.Configurator) (*Client, error) {
+	return NewClientWithOptions(config, WithLogger(logger), WithTLSConfigurator(tlsConfigurator))
+}
+
 // Shutdown is used to shutdown the client
 func (c *Client) Shutdown() error {
 	c.logger.Info("shutting down client")

agent/consul/options.go

@@ -0,0 +1,49 @@
+package consul
+
+import (
+	"github.com/hashicorp/consul/agent/pool"
+	"github.com/hashicorp/consul/agent/token"
+	"github.com/hashicorp/consul/tlsutil"
+	"github.com/hashicorp/go-hclog"
+)
+
+type consulOptions struct {
+	logger          hclog.InterceptLogger
+	tlsConfigurator *tlsutil.Configurator
+	connPool        *pool.ConnPool
+	tokens          *token.Store
+}
+
+type ConsulOption func(*consulOptions)
+
+func WithLogger(logger hclog.InterceptLogger) ConsulOption {
+	return func(opt *consulOptions) {
+		opt.logger = logger
+	}
+}
+
+func WithTLSConfigurator(tlsConfigurator *tlsutil.Configurator) ConsulOption {
+	return func(opt *consulOptions) {
+		opt.tlsConfigurator = tlsConfigurator
+	}
+}
+
+func WithConnectionPool(connPool *pool.ConnPool) ConsulOption {
+	return func(opt *consulOptions) {
+		opt.connPool = connPool
+	}
+}
+
+func WithTokenStore(tokens *token.Store) ConsulOption {
+	return func(opt *consulOptions) {
+		opt.tokens = tokens
+	}
+}
+
+func flattenConsulOptions(options []ConsulOption) consulOptions {
+	var flat consulOptions
+	for _, opt := range options {
+		opt(&flat)
+	}
+	return flat
+}

agent/consul/server.go

@@ -322,6 +322,22 @@ func NewServer(config *Config) (*Server, error) {
 // NewServerLogger is used to construct a new Consul server from the
 // configuration, potentially returning an error
 func NewServerLogger(config *Config, logger hclog.InterceptLogger, tokens *token.Store, tlsConfigurator *tlsutil.Configurator) (*Server, error) {
+	return NewServerWithOptions(config,
+		WithLogger(logger),
+		WithTokenStore(tokens),
+		WithTLSConfigurator(tlsConfigurator))
+}
+
+// NewServerWithOptions is used to construct a new Consul server from the configuration
+// and extra options, potentially returning an error
+func NewServerWithOptions(config *Config, options ...ConsulOption) (*Server, error) {
+	flat := flattenConsulOptions(options)
+
+	logger := flat.logger
+	tokens := flat.tokens
+	tlsConfigurator := flat.tlsConfigurator
+	connPool := flat.connPool
+
 	// Check the protocol version.
 	if err := config.CheckProtocolVersion(); err != nil {
 		return nil, err
@@ -376,7 +392,8 @@ func NewServerLogger(config *Config, logger hclog.InterceptLogger, tokens *token
 	// Create the shutdown channel - this is closed but never written to.
 	shutdownCh := make(chan struct{})
 
-	connPool := &pool.ConnPool{
+	if connPool == nil {
+		connPool = &pool.ConnPool{
 			Server:          true,
 			SrcAddr:         config.RPCSrcAddr,
 			LogOutput:       config.LogOutput,
@@ -385,6 +402,7 @@ func NewServerLogger(config *Config, logger hclog.InterceptLogger, tokens *token
 			TLSConfigurator: tlsConfigurator,
 			Datacenter:      config.Datacenter,
 		}
+	}
 
 	serverLogger := logger.NamedIntercept(logging.ConsulServer)
 	loggers := newLoggerStore(serverLogger)

agent/dns_test.go

@@ -4051,7 +4051,7 @@ func TestDNS_ServiceLookup_OnlyPassing(t *testing.T) {
 
 	newCfg := *a.Config
 	newCfg.DNSOnlyPassing = false
-	err := a.ReloadConfig(&newCfg)
+	err := a.reloadConfigInternal(&newCfg)
 	require.NoError(t, err)
 
 	// only_passing is now false. we should now get two nodes
@@ -6996,7 +6996,7 @@ func TestDNS_ConfigReload(t *testing.T) {
 	newCfg.DNSSOA.Expire = 30
 	newCfg.DNSSOA.Minttl = 40
 
-	err := a.ReloadConfig(&newCfg)
+	err := a.reloadConfigInternal(&newCfg)
 	require.NoError(t, err)
 
 	for _, s := range a.dnsServers {
@@ -7077,7 +7077,7 @@ func TestDNS_ReloadConfig_DuringQuery(t *testing.T) {
 		// reload the config halfway through, that should not affect the ongoing query
 		newCfg := *a.Config
 		newCfg.DNSAllowStale = true
-		a.ReloadConfig(&newCfg)
+		a.reloadConfigInternal(&newCfg)
 
 		select {
 		case in := <-res:

agent/http_test.go

@@ -1447,7 +1447,7 @@ func TestRPC_HTTPSMaxConnsPerClient(t *testing.T) {
 			// Reload config with higher limit
 			newCfg := *a.config
 			newCfg.HTTPMaxConnsPerClient = 10
-			require.NoError(t, a.ReloadConfig(&newCfg))
+			require.NoError(t, a.reloadConfigInternal(&newCfg))
 
 			// Now another conn should be allowed
 			conn4, err := net.DialTimeout("tcp", addr.String(), time.Second)

agent/local/state_test.go

@@ -1914,7 +1914,7 @@ func TestAgent_AliasCheck(t *testing.T) {
 
 func TestAgent_sendCoordinate(t *testing.T) {
 	t.Parallel()
-	a := agent.NewTestAgent(t, `
+	a := agent.StartTestAgent(t, agent.TestAgent{Overrides: `
 		sync_coordinate_interval_min = "1ms"
 		sync_coordinate_rate_target = 10.0
 		consul = {
@@ -1924,7 +1924,7 @@ func TestAgent_sendCoordinate(t *testing.T) {
 				update_max_batches = 1
 			}
 		}
-	`)
+	`})
 	defer a.Shutdown()
 	testrpc.WaitForLeader(t, a.RPC, "dc1")
 

agent/pool/pool.go

@@ -466,7 +466,11 @@ func (p *ConnPool) getNewConn(dc string, nodeName string, addr net.Addr) (*Conn,
 	conf.LogOutput = p.LogOutput
 
 	// Create a multiplexed session
-	session, _ := yamux.Client(conn, conf)
+	session, err := yamux.Client(conn, conf)
+	if err != nil {
+		conn.Close()
+		return nil, fmt.Errorf("Failed to create yamux client: %w", err)
+	}
 
 	// Wrap the connection
 	c := &Conn{
@@ -552,7 +556,11 @@ func (p *ConnPool) RPC(
 		return fmt.Errorf("pool: ConnPool.RPC requires a node name")
 	}
 
-	if method == "AutoEncrypt.Sign" {
+	// TODO (autoconf) probably will want to have a way to invoke the
+	// secure or insecure variant depending on whether its an ongoing
+	// or first time config request. For now though this is fine until
+	// those ongoing requests are implemented.
+	if method == "AutoEncrypt.Sign" || method == "Cluster.AutoConfig" {
 		return p.rpcInsecure(dc, nodeName, addr, method, args, reply)
 	} else {
 		return p.rpc(dc, nodeName, addr, method, args, reply)

agent/testagent.go

@@ -2,6 +2,9 @@ package agent
 
 import (
 	"bytes"
+	"crypto/ecdsa"
+	"crypto/elliptic"
+	"crypto/x509"
 	"fmt"
 	"io"
 	"io/ioutil"
@@ -20,6 +23,7 @@ import (
 	"github.com/hashicorp/go-hclog"
 	uuid "github.com/hashicorp/go-uuid"
 
+	"github.com/hashicorp/consul/acl"
 	"github.com/hashicorp/consul/agent/config"
 	"github.com/hashicorp/consul/agent/connect"
 	"github.com/hashicorp/consul/agent/consul"
@@ -27,6 +31,7 @@ import (
 	"github.com/hashicorp/consul/api"
 	"github.com/hashicorp/consul/sdk/freeport"
 	"github.com/hashicorp/consul/sdk/testutil/retry"
+	"github.com/hashicorp/consul/tlsutil"
 )
 
 func init() {
@@ -81,6 +86,10 @@ type TestAgent struct {
 	// It is valid after Start().
 	srv *HTTPServer
 
+	// overrides is an hcl config source to use to override otherwise
+	// non-user settable configurations
+	Overrides string
+
 	// Agent is the embedded consul agent.
 	// It is valid after Start().
 	*Agent
@@ -100,6 +109,7 @@ func NewTestAgent(t *testing.T, hcl string) *TestAgent {
 // The caller is responsible for calling Shutdown() to stop the agent and remove
 // temporary directories.
 func StartTestAgent(t *testing.T, a TestAgent) *TestAgent {
+	t.Helper()
 	retry.RunWith(retry.ThreeTimes(), t, func(r *retry.R) {
 		if err := a.Start(t); err != nil {
 			r.Fatal(err)
@@ -109,9 +119,31 @@ func StartTestAgent(t *testing.T, a TestAgent) *TestAgent {
 	return &a
 }
 
+func TestConfigHCL(nodeID string) string {
+	return fmt.Sprintf(`
+		bind_addr = "127.0.0.1"
+		advertise_addr = "127.0.0.1"
+		datacenter = "dc1"
+		bootstrap = true
+		server = true
+		node_id = "%[1]s"
+		node_name = "Node-%[1]s"
+		connect {
+			enabled = true
+			ca_config {
+				cluster_id = "%[2]s"
+			}
+		}
+		performance {
+			raft_multiplier = 1
+		}`, nodeID, connect.TestClusterID,
+	)
+}
+
 // Start starts a test agent. It returns an error if the agent could not be started.
 // If no error is returned, the caller must call Shutdown() when finished.
 func (a *TestAgent) Start(t *testing.T) (err error) {
+	t.Helper()
 	if a.Agent != nil {
 		return fmt.Errorf("TestAgent already started")
 	}
@@ -148,6 +180,7 @@ func (a *TestAgent) Start(t *testing.T) (err error) {
 		// parsing.
 		d = filepath.ToSlash(d)
 		hclDataDir = `data_dir = "` + d + `"`
+		a.DataDir = d
 	}
 
 	logOutput := a.LogOutput
@@ -164,11 +197,27 @@ func (a *TestAgent) Start(t *testing.T) (err error) {
 
 	portsConfig, returnPortsFn := randomPortsSource(a.UseTLS)
 	a.returnPortsFn = returnPortsFn
-	a.Config = TestConfig(logger,
+
+	nodeID := NodeID()
+
+	opts := []AgentOption{
+		WithLogger(logger),
+		WithBuilderOpts(config.BuilderOpts{
+			HCL: []string{
+				TestConfigHCL(nodeID),
 				portsConfig,
-		config.Source{Name: name, Format: "hcl", Data: a.HCL},
+				a.HCL,
-		config.Source{Name: name + ".data_dir", Format: "hcl", Data: hclDataDir},
+				hclDataDir,
-	)
+			},
+		}),
+		WithOverrides(config.Source{
+			Name:   "test-overrides",
+			Format: "hcl",
+			Data:   a.Overrides},
+			config.DefaultConsulSource(),
+			config.DevConsulSource(),
+		),
+	}
 
 	defer func() {
 		if err != nil && a.returnPortsFn != nil {
@@ -180,7 +229,7 @@ func (a *TestAgent) Start(t *testing.T) (err error) {
 	// write the keyring
 	if a.Key != "" {
 		writeKey := func(key, filename string) error {
-			path := filepath.Join(a.Config.DataDir, filename)
+			path := filepath.Join(a.DataDir, filename)
 			if err := initKeyring(path, key); err != nil {
 				cleanupTmpDir()
 				return fmt.Errorf("Error creating keyring %s: %s", path, err)
@@ -197,13 +246,14 @@ func (a *TestAgent) Start(t *testing.T) (err error) {
 		}
 	}
 
-	agent, err := New(a.Config, logger)
+	agent, err := New(opts...)
 	if err != nil {
 		cleanupTmpDir()
 		return fmt.Errorf("Error creating agent: %s", err)
 	}
 
-	agent.LogOutput = logOutput
+	a.Config = agent.GetConfig()
+
 	agent.MemSink = metrics.NewInmemSink(1*time.Second, time.Minute)
 
 	id := string(a.Config.NodeID)
@@ -224,6 +274,7 @@ func (a *TestAgent) Start(t *testing.T) (err error) {
 	if err := a.waitForUp(); err != nil {
 		cleanupTmpDir()
 		a.Shutdown()
+		t.Logf("Error while waiting for test agent to start: %v", err)
 		return errwrap.Wrapf(name+": {{err}}", err)
 	}
 
@@ -271,7 +322,11 @@ func (a *TestAgent) waitForUp() error {
 			req := httptest.NewRequest("GET", "/v1/agent/self", nil)
 			resp := httptest.NewRecorder()
 			_, err := a.httpServers[0].AgentSelf(resp, req)
-			if err != nil || resp.Code != 200 {
+			if acl.IsErrPermissionDenied(err) || resp.Code == 403 {
+				// permission denied is enough to show that the client is
+				// connected to the servers as it would get a 503 if
+				// it couldn't connect to them.
+			} else if err != nil && resp.Code != 200 {
 				retErr = fmt.Errorf("failed OK response: %v", err)
 				continue
 			}
@@ -372,7 +427,7 @@ func (a *TestAgent) consulConfig() *consul.Config {
 // chance of port conflicts for concurrently executed test binaries.
 // Instead of relying on one set of ports to be sufficient we retry
 // starting the agent with different ports on port conflict.
-func randomPortsSource(tls bool) (src config.Source, returnPortsFn func()) {
+func randomPortsSource(tls bool) (data string, returnPortsFn func()) {
 	ports := freeport.MustTake(7)
 
 	var http, https int
@@ -384,10 +439,7 @@ func randomPortsSource(tls bool) (src config.Source, returnPortsFn func()) {
 		https = -1
 	}
 
-	return config.Source{
+	return `
-		Name:   "ports",
-		Format: "hcl",
-		Data: `
 		ports = {
 			dns = ` + strconv.Itoa(ports[0]) + `
 			http = ` + strconv.Itoa(http) + `
@@ -397,8 +449,7 @@ func randomPortsSource(tls bool) (src config.Source, returnPortsFn func()) {
 			server = ` + strconv.Itoa(ports[5]) + `
 			grpc = ` + strconv.Itoa(ports[6]) + `
 		}
-		`,
+	`, func() { freeport.Return(ports) }
-	}, func() { freeport.Return(ports) }
 }
 
 func NodeID() string {
@@ -518,34 +569,34 @@ func TestACLConfigNew() string {
 }
 
 var aclConfigTpl = template.Must(template.New("ACL Config").Parse(`
-   {{if ne .PrimaryDatacenter ""}}
+   {{- if ne .PrimaryDatacenter "" -}}
 	primary_datacenter = "{{ .PrimaryDatacenter }}"
-	{{end}}
+	{{end -}}
 	acl {
 		enabled = true
-		{{if ne .DefaultPolicy ""}}
+		{{- if ne .DefaultPolicy ""}}
 		default_policy = "{{ .DefaultPolicy }}"
-		{{end}}
+		{{- end}}
 		enable_token_replication = {{printf "%t" .EnableTokenReplication }}
-		{{if .HasConfiguredTokens }}
+		{{- if .HasConfiguredTokens}}
 		tokens {
-			{{if ne .MasterToken ""}}
+			{{- if ne .MasterToken ""}}
 			master = "{{ .MasterToken }}"
-			{{end}}
+			{{- end}}
-			{{if ne .AgentToken ""}}
+			{{- if ne .AgentToken ""}}
 			agent = "{{ .AgentToken }}"
-			{{end}}
+			{{- end}}
-			{{if ne .AgentMasterToken "" }}
+			{{- if ne .AgentMasterToken "" }}
 			agent_master = "{{ .AgentMasterToken }}"
-			{{end}}
+			{{- end}}
-			{{if ne .DefaultToken "" }}
+			{{- if ne .DefaultToken "" }}
 			default = "{{ .DefaultToken }}"
-			{{end}}
+			{{- end}}
-			{{if ne .ReplicationToken "" }}
+			{{- if ne .ReplicationToken ""  }}
 			replication = "{{ .ReplicationToken }}"
-			{{end}}
+			{{- end}}
 		}
-		{{end}}
+		{{- end}}
 	}
 `))
 
@@ -564,3 +615,43 @@ func TestACLConfigWithParams(params *TestACLConfigParams) string {
 
 	return buf.String()
 }
+
+// testTLSCertificates Generates a TLS CA and server key/cert and returns them
+// in PEM encoded form.
+func testTLSCertificates(serverName string) (cert string, key string, cacert string, err error) {
+	// generate CA
+	serial, err := tlsutil.GenerateSerialNumber()
+	if err != nil {
+		return "", "", "", err
+	}
+	signer, err := ecdsa.GenerateKey(elliptic.P256(), rand.New(rand.NewSource(99)))
+	if err != nil {
+		return "", "", "", err
+	}
+	ca, err := tlsutil.GenerateCA(signer, serial, 365, nil)
+	if err != nil {
+		return "", "", "", err
+	}
+
+	// generate leaf
+	serial, err = tlsutil.GenerateSerialNumber()
+	if err != nil {
+		return "", "", "", err
+	}
+
+	cert, privateKey, err := tlsutil.GenerateCert(
+		signer,
+		ca,
+		serial,
+		"Test Cert Name",
+		365,
+		[]string{serverName},
+		nil,
+		[]x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth, x509.ExtKeyUsageClientAuth},
+	)
+	if err != nil {
+		return "", "", "", err
+	}
+
+	return cert, privateKey, ca, nil
+}

command/acl/authmethod/create/authmethod_create_test.go

@@ -48,7 +48,7 @@ func TestAuthMethodCreateCommand(t *testing.T) {
 	}`)
 
 	defer a.Shutdown()
-	testrpc.WaitForLeader(t, a.RPC, "dc1")
+	testrpc.WaitForTestAgent(t, a.RPC, "dc1", testrpc.WithToken("root"))
 	client := a.Client()
 
 	t.Run("type required", func(t *testing.T) {
@@ -201,7 +201,7 @@ func TestAuthMethodCreateCommand_JSON(t *testing.T) {
 	}`)
 
 	defer a.Shutdown()
-	testrpc.WaitForLeader(t, a.RPC, "dc1")
+	testrpc.WaitForTestAgent(t, a.RPC, "dc1", testrpc.WithToken("root"))
 	client := a.Client()
 
 	t.Run("type required", func(t *testing.T) {
@@ -369,7 +369,7 @@ func TestAuthMethodCreateCommand_k8s(t *testing.T) {
 	}`)
 
 	defer a.Shutdown()
-	testrpc.WaitForLeader(t, a.RPC, "dc1")
+	testrpc.WaitForTestAgent(t, a.RPC, "dc1", testrpc.WithToken("root"))
 	client := a.Client()
 
 	t.Run("k8s host required", func(t *testing.T) {
@@ -512,7 +512,7 @@ func TestAuthMethodCreateCommand_config(t *testing.T) {
 	}`)
 
 	defer a.Shutdown()
-	testrpc.WaitForLeader(t, a.RPC, "dc1")
+	testrpc.WaitForTestAgent(t, a.RPC, "dc1", testrpc.WithToken("root"))
 	client := a.Client()
 
 	checkMethod := func(t *testing.T, methodName string) {

command/acl/policy/read/policy_read_test.go

@@ -40,7 +40,7 @@ func TestPolicyReadCommand(t *testing.T) {
 	}`)
 
 	defer a.Shutdown()
-	testrpc.WaitForLeader(t, a.RPC, "dc1")
+	testrpc.WaitForTestAgent(t, a.RPC, "dc1", testrpc.WithToken("root"))
 
 	ui := cli.NewMockUi()
 	cmd := New(ui)
@@ -86,7 +86,7 @@ func TestPolicyReadCommand_JSON(t *testing.T) {
 	}`)
 
 	defer a.Shutdown()
-	testrpc.WaitForLeader(t, a.RPC, "dc1")
+	testrpc.WaitForTestAgent(t, a.RPC, "dc1", testrpc.WithToken("root"))
 
 	ui := cli.NewMockUi()
 	cmd := New(ui)

command/agent/agent.go

@@ -18,9 +18,7 @@ import (
 	"github.com/hashicorp/consul/service_os"
 	"github.com/hashicorp/go-checkpoint"
 	"github.com/hashicorp/go-hclog"
-	multierror "github.com/hashicorp/go-multierror"
 	"github.com/mitchellh/cli"
-	"google.golang.org/grpc/grpclog"
 )
 
 func New(ui cli.Ui, revision, version, versionPre, versionHuman string, shutdownCh <-chan struct{}) *cmd {
@@ -80,25 +78,6 @@ func (c *cmd) Run(args []string) int {
 	return code
 }
 
-// readConfig is responsible for setup of our configuration using
-// the command line and any file configs
-func (c *cmd) readConfig() *config.RuntimeConfig {
-	b, err := config.NewBuilder(c.flagArgs)
-	if err != nil {
-		c.UI.Error(err.Error())
-		return nil
-	}
-	cfg, err := b.BuildAndValidate()
-	if err != nil {
-		c.UI.Error(err.Error())
-		return nil
-	}
-	for _, w := range b.Warnings {
-		c.UI.Warn(w)
-	}
-	return &cfg
-}
-
 // checkpointResults is used to handler periodic results from our update checker
 func (c *cmd) checkpointResults(results *checkpoint.CheckResponse, err error) {
 	if err != nil {
@@ -185,29 +164,22 @@ func (c *cmd) run(args []string) int {
 		return 1
 	}
 
-	config := c.readConfig()
+	logGate := logging.GatedWriter{Writer: &cli.UiWriter{Ui: c.UI}}
-	if config == nil {
+
+	agentOptions := []agent.AgentOption{
+		agent.WithBuilderOpts(c.flagArgs),
+		agent.WithCLI(c.UI),
+		agent.WithLogWriter(&logGate),
+	}
+
+	agent, err := agent.New(agentOptions...)
+	if err != nil {
+		c.UI.Error(err.Error())
 		return 1
 	}
 
-	// Setup the log outputs
+	config := agent.GetConfig()
-	logConfig := &logging.Config{
+	c.logger = agent.GetLogger()
-		LogLevel:          config.LogLevel,
-		LogJSON:           config.LogJSON,
-		Name:              logging.Agent,
-		EnableSyslog:      config.EnableSyslog,
-		SyslogFacility:    config.SyslogFacility,
-		LogFilePath:       config.LogFile,
-		LogRotateDuration: config.LogRotateDuration,
-		LogRotateBytes:    config.LogRotateBytes,
-		LogRotateMaxFiles: config.LogRotateMaxFiles,
-	}
-	logger, logGate, logOutput, ok := logging.Setup(logConfig, c.UI)
-	if !ok {
-		return 1
-	}
-
-	c.logger = logger
 
 	//Setup gate to check if we should output CLI information
 	cli := GatedUi{
@@ -215,26 +187,8 @@ func (c *cmd) run(args []string) int {
 		ui:         c.UI,
 	}
 
-	// Setup gRPC logger to use the same output/filtering
-	grpclog.SetLoggerV2(logging.NewGRPCLogger(logConfig, c.logger))
-
-	memSink, err := lib.InitTelemetry(config.Telemetry)
-	if err != nil {
-		c.logger.Error(err.Error())
-		logGate.Flush()
-		return 1
-	}
-
 	// Create the agent
 	cli.output("Starting Consul agent...")
-	agent, err := agent.New(config, c.logger)
-	if err != nil {
-		c.logger.Error("Error creating agent", "error", err)
-		logGate.Flush()
-		return 1
-	}
-	agent.LogOutput = logOutput
-	agent.MemSink = memSink
 
 	segment := config.SegmentName
 	if config.ServerMode {
@@ -327,13 +281,9 @@ func (c *cmd) run(args []string) int {
 
 	for {
 		var sig os.Signal
-		var reloadErrCh chan error
 		select {
 		case s := <-signalCh:
 			sig = s
-		case ch := <-agent.ReloadCh():
-			sig = syscall.SIGHUP
-			reloadErrCh = ch
 		case <-service_os.Shutdown_Channel():
 			sig = os.Interrupt
 		case <-c.shutdownCh:
@@ -353,18 +303,11 @@ func (c *cmd) run(args []string) int {
 		case syscall.SIGHUP:
 			c.logger.Info("Caught", "signal", sig)
 
-			conf, err := c.handleReload(agent, config)
+			err := agent.ReloadConfig()
-			if conf != nil {
-				config = conf
-			}
 			if err != nil {
 				c.logger.Error("Reload config failed", "error", err)
 			}
-			// Send result back if reload was called via HTTP
+			config = agent.GetConfig()
-			if reloadErrCh != nil {
-				reloadErrCh <- err
-			}
-
 		default:
 			c.logger.Info("Caught", "signal", sig)
 
@@ -400,37 +343,6 @@ func (c *cmd) run(args []string) int {
 	}
 }
 
-// handleReload is invoked when we should reload our configs, e.g. SIGHUP
-func (c *cmd) handleReload(agent *agent.Agent, cfg *config.RuntimeConfig) (*config.RuntimeConfig, error) {
-	c.logger.Info("Reloading configuration...")
-	var errs error
-	newCfg := c.readConfig()
-	if newCfg == nil {
-		errs = multierror.Append(errs, fmt.Errorf("Failed to reload configs"))
-		return cfg, errs
-	}
-
-	// Change the log level
-	if logging.ValidateLogLevel(newCfg.LogLevel) {
-		c.logger.SetLevel(logging.LevelFromString(newCfg.LogLevel))
-	} else {
-		errs = multierror.Append(fmt.Errorf(
-			"Invalid log level: %s. Valid log levels are: %v",
-			newCfg.LogLevel, logging.AllowedLogLevels()))
-
-		// Keep the current log level
-		newCfg.LogLevel = cfg.LogLevel
-
-	}
-
-	if err := agent.ReloadConfig(newCfg); err != nil {
-		errs = multierror.Append(fmt.Errorf(
-			"Failed to reload configs: %v", err))
-	}
-
-	return newCfg, errs
-}
-
 func (g *GatedUi) output(s string) {
 	if !g.JSONoutput {
 		g.ui.Output(s)

command/agent/agent_test.go

@@ -11,7 +11,6 @@ import (
 	"github.com/hashicorp/consul/testrpc"
 
 	"github.com/hashicorp/consul/agent"
-	"github.com/hashicorp/consul/agent/config"
 	"github.com/hashicorp/consul/sdk/testutil"
 	"github.com/hashicorp/consul/sdk/testutil/retry"
 	"github.com/mitchellh/cli"
@@ -205,67 +204,3 @@ func TestBadDataDirPermissions(t *testing.T) {
 		t.Fatalf("expected permission denied error, got: %s", out)
 	}
 }
-
-func TestReloadLoggerFail(t *testing.T) {
-	a := agent.NewTestAgent(t, "")
-	defer a.Shutdown()
-
-	ui := cli.NewMockUi()
-	cmd := New(ui, "", "", "", "", nil)
-
-	bindAddr := a.Config.BindAddr.String()
-	cmd.flagArgs.Config.BindAddr = &bindAddr
-	cmd.flagArgs.Config.DataDir = &a.Config.DataDir
-
-	cmd.logger = testutil.Logger(t)
-
-	newLogLevel := "BLAH"
-	cmd.flagArgs.Config.LogLevel = &newLogLevel
-
-	oldCfg := config.RuntimeConfig{
-		LogLevel: "INFO",
-	}
-	cfg, err := cmd.handleReload(a.Agent, &oldCfg)
-	if err == nil {
-		t.Fatal("Should fail with bad log level")
-	}
-
-	if !strings.Contains(err.Error(), "Invalid log level") {
-		t.Fatalf("expected invalid log level error, got: %s", err)
-	}
-	if cfg.LogLevel != "INFO" {
-		t.Fatalf("expected log level to stay the same, got: %s", cfg.LogLevel)
-	}
-}
-
-func TestReloadLoggerSuccess(t *testing.T) {
-	a := agent.NewTestAgent(t, "")
-	defer a.Shutdown()
-
-	ui := cli.NewMockUi()
-	cmd := New(ui, "", "", "", "", nil)
-
-	bindAddr := a.Config.BindAddr.String()
-	cmd.flagArgs.Config.BindAddr = &bindAddr
-	cmd.flagArgs.Config.DataDir = &a.Config.DataDir
-
-	cmd.logger = testutil.Logger(t)
-
-	newLogLevel := "ERROR"
-	cmd.flagArgs.Config.LogLevel = &newLogLevel
-
-	oldCfg := config.RuntimeConfig{
-		LogLevel: "INFO",
-	}
-	cfg, err := cmd.handleReload(a.Agent, &oldCfg)
-	if err != nil {
-		t.Fatalf("unexpected error: %s", err)
-	}
-
-	if cfg.LogLevel != "ERROR" {
-		t.Fatalf("expected log level to change to 'ERROR', got: %s", cfg.LogLevel)
-	}
-	if cmd.logger.IsWarn() || !cmd.logger.IsError() {
-		t.Fatal("expected logger level to change to 'ERROR'")
-	}
-}

command/connect/proxy/proxy.go

@@ -3,6 +3,7 @@ package proxy
 import (
 	"flag"
 	"fmt"
+	"io"
 	"log"
 	"net"
 	"net/http"
@@ -136,8 +137,12 @@ func (c *cmd) Run(args []string) int {
 		Name:     logging.Proxy,
 		LogJSON:  c.logJSON,
 	}
-	logger, logGate, _, ok := logging.Setup(logConfig, c.UI)
+
-	if !ok {
+	logGate := logging.GatedWriter{Writer: &cli.UiWriter{Ui: c.UI}}
+
+	logger, _, err := logging.Setup(logConfig, []io.Writer{&logGate})
+	if err != nil {
+		c.UI.Error(err.Error())
 		return 1
 	}
 	c.logger = logger

command/reload/reload_test.go

@@ -21,11 +21,6 @@ func TestReloadCommand(t *testing.T) {
 	defer a.Shutdown()
 
 	// Setup a dummy response to errCh to simulate a successful reload
-	go func() {
-		errCh := <-a.ReloadCh()
-		errCh <- nil
-	}()
-
 	ui := cli.NewMockUi()
 	c := New(ui)
 	args := []string{"-http-addr=" + a.HTTPAddr()}

connect/service_test.go

@@ -127,7 +127,11 @@ func TestService_Dial(t *testing.T) {
 func TestService_ServerTLSConfig(t *testing.T) {
 	require := require.New(t)
 
-	a := agent.StartTestAgent(t, agent.TestAgent{Name: "007"})
+	a := agent.StartTestAgent(t, agent.TestAgent{Name: "007", Overrides: `
+		connect {
+			test_ca_leaf_root_change_spread = "1ns"
+		}
+	`})
 	defer a.Shutdown()
 	testrpc.WaitForTestAgent(t, a.RPC, "dc1")
 	client := a.Client()

logging/logger.go

@@ -8,7 +8,6 @@ import (
 
 	"github.com/hashicorp/go-hclog"
 	gsyslog "github.com/hashicorp/go-syslog"
-	"github.com/mitchellh/cli"
 )
 
 // Config is used to set up logging.
@@ -51,6 +50,8 @@ var (
 	logRotateBytes    int
 )
 
+type LogSetupErrorFn func(string)
+
 // Setup is used to perform setup of several logging objects:
 //
 // * A hclog.Logger is used to perform filtering by log level and write to io.Writer.
@@ -62,17 +63,11 @@ var (
 // The provided ui object will get any log messages related to setting up
 // logging itself, and will also be hooked up to the gated logger. The final bool
 // parameter indicates if logging was set up successfully.
-func Setup(config *Config, ui cli.Ui) (hclog.InterceptLogger, *GatedWriter, io.Writer, bool) {
+func Setup(config *Config, writers []io.Writer) (hclog.InterceptLogger, io.Writer, error) {
-	// The gated writer buffers logs at startup and holds until it's flushed.
-	logGate := &GatedWriter{
-		Writer: &cli.UiWriter{Ui: ui},
-	}
-
 	if !ValidateLogLevel(config.LogLevel) {
-		ui.Error(fmt.Sprintf(
+		return nil, nil, fmt.Errorf("Invalid log level: %s. Valid log levels are: %v",
-			"Invalid log level: %s. Valid log levels are: %v",
+			config.LogLevel,
-			config.LogLevel, allowedLogLevels))
+			allowedLogLevels)
-		return nil, nil, nil, false
 	}
 
 	// Set up syslog if it's enabled.
@@ -87,20 +82,15 @@ func Setup(config *Config, ui cli.Ui) (hclog.InterceptLogger, *GatedWriter, io.W
 				break
 			}
 
-			ui.Error(fmt.Sprintf("Syslog setup error: %v", err))
 			if i == retries {
 				timeout := time.Duration(retries) * delay
-				ui.Error(fmt.Sprintf("Syslog setup did not succeed within timeout (%s).", timeout.String()))
+				return nil, nil, fmt.Errorf("Syslog setup did not succeed within timeout (%s).", timeout.String())
-				return nil, nil, nil, false
 			}
 
-			ui.Error(fmt.Sprintf("Retrying syslog setup in %s...", delay.String()))
 			time.Sleep(delay)
 		}
 	}
-	writers := []io.Writer{logGate}
 
-	var logOutput io.Writer
 	if syslog != nil {
 		writers = append(writers, syslog)
 	}
@@ -131,13 +121,12 @@ func Setup(config *Config, ui cli.Ui) (hclog.InterceptLogger, *GatedWriter, io.W
 			MaxFiles: config.LogRotateMaxFiles,
 		}
 		if err := logFile.openNew(); err != nil {
-			ui.Error(fmt.Sprintf("Failed to setup logging: %v", err))
+			return nil, nil, fmt.Errorf("Failed to setup logging: %w", err)
-			return nil, nil, nil, false
 		}
 		writers = append(writers, logFile)
 	}
 
-	logOutput = io.MultiWriter(writers...)
+	logOutput := io.MultiWriter(writers...)
 
 	logger := hclog.NewInterceptLogger(&hclog.LoggerOptions{
 		Level:      LevelFromString(config.LogLevel),
@@ -146,5 +135,5 @@ func Setup(config *Config, ui cli.Ui) (hclog.InterceptLogger, *GatedWriter, io.W
 		JSONFormat: config.LogJSON,
 	})
 
-	return logger, logGate, logOutput, true
+	return logger, logOutput, nil
 }

logging/logger_test.go

@@ -1,12 +1,14 @@
 package logging
 
 import (
+	"bytes"
 	"encoding/json"
+	"errors"
+	"io"
 	"os"
 	"testing"
 
 	"github.com/hashicorp/consul/sdk/testutil"
-	"github.com/mitchellh/cli"
 	"github.com/stretchr/testify/require"
 )
 
@@ -16,24 +18,19 @@ func TestLogger_SetupBasic(t *testing.T) {
 	cfg := &Config{
 		LogLevel: "INFO",
 	}
-	ui := cli.NewMockUi()
 
-	logger, gatedWriter, writer, ok := Setup(cfg, ui)
+	logger, writer, err := Setup(cfg, nil)
-	require.True(ok)
+	require.NoError(err)
-	require.NotNil(gatedWriter)
 	require.NotNil(writer)
 	require.NotNil(logger)
 }
 
 func TestLogger_SetupInvalidLogLevel(t *testing.T) {
 	t.Parallel()
-	require := require.New(t)
 	cfg := &Config{}
-	ui := cli.NewMockUi()
 
-	_, _, _, ok := Setup(cfg, ui)
+	_, _, err := Setup(cfg, nil)
-	require.False(ok)
+	testutil.RequireErrorContains(t, err, "Invalid log level")
-	require.Contains(ui.ErrorWriter.String(), "Invalid log level")
 }
 
 func TestLogger_SetupLoggerErrorLevel(t *testing.T) {
@@ -63,20 +60,19 @@ func TestLogger_SetupLoggerErrorLevel(t *testing.T) {
 
 			c.before(&cfg)
 			require := require.New(t)
-			ui := cli.NewMockUi()
+			var buf bytes.Buffer
 
-			logger, gatedWriter, _, ok := Setup(&cfg, ui)
+			logger, _, err := Setup(&cfg, []io.Writer{&buf})
-			require.True(ok)
+			require.NoError(err)
 			require.NotNil(logger)
-			require.NotNil(gatedWriter)
-
-			gatedWriter.Flush()
 
 			logger.Error("test error msg")
 			logger.Info("test info msg")
 
-			require.Contains(ui.OutputWriter.String(), "[ERROR] test error msg")
+			output := buf.String()
-			require.NotContains(ui.OutputWriter.String(), "[INFO]  test info msg")
+
+			require.Contains(output, "[ERROR] test error msg")
+			require.NotContains(output, "[INFO]  test info msg")
 		})
 	}
 }
@@ -87,20 +83,19 @@ func TestLogger_SetupLoggerDebugLevel(t *testing.T) {
 	cfg := &Config{
 		LogLevel: "DEBUG",
 	}
-	ui := cli.NewMockUi()
+	var buf bytes.Buffer
 
-	logger, gatedWriter, _, ok := Setup(cfg, ui)
+	logger, _, err := Setup(cfg, []io.Writer{&buf})
-	require.True(ok)
+	require.NoError(err)
 	require.NotNil(logger)
-	require.NotNil(gatedWriter)
-
-	gatedWriter.Flush()
 
 	logger.Info("test info msg")
 	logger.Debug("test debug msg")
 
-	require.Contains(ui.OutputWriter.String(), "[INFO]  test info msg")
+	output := buf.String()
-	require.Contains(ui.OutputWriter.String(), "[DEBUG] test debug msg")
+
+	require.Contains(output, "[INFO]  test info msg")
+	require.Contains(output, "[DEBUG] test debug msg")
 }
 
 func TestLogger_SetupLoggerWithName(t *testing.T) {
@@ -110,18 +105,15 @@ func TestLogger_SetupLoggerWithName(t *testing.T) {
 		LogLevel: "DEBUG",
 		Name:     "test-system",
 	}
-	ui := cli.NewMockUi()
+	var buf bytes.Buffer
 
-	logger, gatedWriter, _, ok := Setup(cfg, ui)
+	logger, _, err := Setup(cfg, []io.Writer{&buf})
-	require.True(ok)
+	require.NoError(err)
 	require.NotNil(logger)
-	require.NotNil(gatedWriter)
-
-	gatedWriter.Flush()
 
 	logger.Warn("test warn msg")
 
-	require.Contains(ui.OutputWriter.String(), "[WARN]  test-system: test warn msg")
+	require.Contains(buf.String(), "[WARN]  test-system: test warn msg")
 }
 
 func TestLogger_SetupLoggerWithJSON(t *testing.T) {
@@ -132,19 +124,16 @@ func TestLogger_SetupLoggerWithJSON(t *testing.T) {
 		LogJSON:  true,
 		Name:     "test-system",
 	}
-	ui := cli.NewMockUi()
+	var buf bytes.Buffer
 
-	logger, gatedWriter, _, ok := Setup(cfg, ui)
+	logger, _, err := Setup(cfg, []io.Writer{&buf})
-	require.True(ok)
+	require.NoError(err)
 	require.NotNil(logger)
-	require.NotNil(gatedWriter)
-
-	gatedWriter.Flush()
 
 	logger.Warn("test warn msg")
 
 	var jsonOutput map[string]string
-	err := json.Unmarshal(ui.OutputWriter.Bytes(), &jsonOutput)
+	err = json.Unmarshal(buf.Bytes(), &jsonOutput)
 	require.NoError(err)
 	require.Contains(jsonOutput, "@level")
 	require.Equal(jsonOutput["@level"], "warn")
@@ -163,13 +152,11 @@ func TestLogger_SetupLoggerWithValidLogPath(t *testing.T) {
 		LogLevel:    "INFO",
 		LogFilePath: tmpDir + "/",
 	}
-	ui := cli.NewMockUi()
+	var buf bytes.Buffer
 
-	logger, gatedWriter, writer, ok := Setup(cfg, ui)
+	logger, _, err := Setup(cfg, []io.Writer{&buf})
-	require.True(ok)
+	require.NoError(err)
 	require.NotNil(logger)
-	require.NotNil(gatedWriter)
-	require.NotNil(writer)
 }
 
 func TestLogger_SetupLoggerWithInValidLogPath(t *testing.T) {
@@ -180,14 +167,12 @@ func TestLogger_SetupLoggerWithInValidLogPath(t *testing.T) {
 		LogLevel:    "INFO",
 		LogFilePath: "nonexistentdir/",
 	}
-	ui := cli.NewMockUi()
+	var buf bytes.Buffer
 
-	logger, gatedWriter, writer, ok := Setup(cfg, ui)
+	logger, _, err := Setup(cfg, []io.Writer{&buf})
-	require.Contains(ui.ErrorWriter.String(), "no such file or directory")
+	require.Error(err)
-	require.False(ok)
+	require.True(errors.Is(err, os.ErrNotExist))
 	require.Nil(logger)
-	require.Nil(gatedWriter)
-	require.Nil(writer)
 }
 
 func TestLogger_SetupLoggerWithInValidLogPathPermission(t *testing.T) {
@@ -203,12 +188,10 @@ func TestLogger_SetupLoggerWithInValidLogPathPermission(t *testing.T) {
 		LogLevel:    "INFO",
 		LogFilePath: tmpDir + "/",
 	}
-	ui := cli.NewMockUi()
+	var buf bytes.Buffer
 
-	logger, gatedWriter, writer, ok := Setup(cfg, ui)
+	logger, _, err := Setup(cfg, []io.Writer{&buf})
-	require.Contains(ui.ErrorWriter.String(), "permission denied")
+	require.Error(err)
-	require.False(ok)
+	require.True(errors.Is(err, os.ErrPermission))
 	require.Nil(logger)
-	require.Nil(gatedWriter)
-	require.Nil(writer)
 }

logging/names.go

@@ -5,6 +5,7 @@ const (
 	Agent              string = "agent"
 	AntiEntropy        string = "anti_entropy"
 	AutoEncrypt        string = "auto_encrypt"
+	AutoConfig         string = "auto_config"
 	Autopilot          string = "autopilot"
 	AWS                string = "aws"
 	Azure              string = "azure"