Add TCP+TLS Healthchecks (#18381)

* Begin adding TCPUseTLS

* More TCP with TLS plumbing

* Making forward progress

* Keep on adding TCP+TLS support for healthchecks

* Removed too many lines

* Unit tests for TCP+TLS

* Update tlsutil/config.go

Co-authored-by: Samantha <hello@entropy.cat>

* Working on the tcp+tls unit test

* Updated the runtime integration tests

* Progress

* Revert this file back to HEAD

* Remove debugging lines

* Implement TLS enabled TCP socket server and make a successful TCP+TLS healthcheck on it

* Update docs

* Update agent/agent_test.go

Co-authored-by: Samantha <hello@entropy.cat>

* Update website/content/docs/ecs/configuration-reference.mdx

Co-authored-by: Samantha <hello@entropy.cat>

* Update website/content/docs/ecs/configuration-reference.mdx

Co-authored-by: Samantha <hello@entropy.cat>

* Update agent/checks/check.go

Co-authored-by: Samantha <hello@entropy.cat>

* Address comments

* Remove extraneous bracket

* Update agent/agent_test.go

Co-authored-by: Samantha <hello@entropy.cat>

* Update agent/agent_test.go

Co-authored-by: Samantha <hello@entropy.cat>

* Update website/content/docs/ecs/configuration-reference.mdx

Co-authored-by: Samantha <hello@entropy.cat>

* Update the mockTLSServer

* Remove trailing newline

* Address comments

* Fix merge problem

* Add changelog entry

---------

Co-authored-by: Samantha <hello@entropy.cat>

.changelog/18381.txt

@@ -0,0 +1,6 @@
+```release-note:improvement
+checks: It is now possible to configure agent TCP checks to use TLS with
+optional server SNI and mutual authentication. To use TLS with a TCP check, the
+check must enable the `tcp_use_tls` boolean. By default the agent will use the
+TLS configuration in the `tls.default` stanza. 
+```

agent/agent.go

@@ -3066,14 +3066,20 @@ func (a *Agent) addCheck(check *structs.HealthCheck, chkType *structs.CheckType,
 				chkType.Interval = checks.MinInterval
 			}
 
+			var tlsClientConfig *tls.Config
+			if chkType.TCPUseTLS {
+				tlsClientConfig = a.tlsConfigurator.OutgoingTLSConfigForCheck(chkType.TLSSkipVerify, chkType.TLSServerName)
+			}
+
 			tcp := &checks.CheckTCP{
-				CheckID:       cid,
-				ServiceID:     sid,
-				TCP:           chkType.TCP,
-				Interval:      chkType.Interval,
-				Timeout:       chkType.Timeout,
-				Logger:        a.logger,
-				StatusHandler: statusHandler,
+				CheckID:         cid,
+				ServiceID:       sid,
+				TCP:             chkType.TCP,
+				Interval:        chkType.Interval,
+				Timeout:         chkType.Timeout,
+				Logger:          a.logger,
+				TLSClientConfig: tlsClientConfig,
+				StatusHandler:   statusHandler,
 			}
 			tcp.Start()
 			a.checkTCPs[cid] = tcp

agent/agent_test.go

@@ -14,11 +14,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
-	"github.com/hashicorp/consul/agent/grpc-external/limiter"
-	"github.com/hashicorp/consul/agent/proxycfg"
-	"github.com/hashicorp/consul/agent/proxycfg-sources/local"
-	"github.com/hashicorp/consul/agent/xds"
-	proxytracker "github.com/hashicorp/consul/internal/mesh/proxy-tracker"
+	"io"
 	mathrand "math/rand"
 	"net"
 	"net/http"
@@ -34,6 +30,12 @@ import (
 	"testing"
 	"time"
 
+	"github.com/hashicorp/consul/agent/grpc-external/limiter"
+	"github.com/hashicorp/consul/agent/proxycfg"
+	"github.com/hashicorp/consul/agent/proxycfg-sources/local"
+	"github.com/hashicorp/consul/agent/xds"
+	proxytracker "github.com/hashicorp/consul/internal/mesh/proxy-tracker"
+
 	"github.com/google/go-cmp/cmp"
 	"github.com/google/go-cmp/cmp/cmpopts"
 	"github.com/google/tcpproxy"
@@ -973,6 +975,80 @@ func TestAgent_AddServiceWithH2CPINGCheck(t *testing.T) {
 	requireCheckExists(t, a, "test-h2cping-check")
 }
 
+func startMockTLSServer(t *testing.T) (addr string, closeFunc func() error) {
+	// Load certificates
+	cert, err := tls.LoadX509KeyPair("../test/key/ourdomain_server.cer", "../test/key/ourdomain_server.key")
+	require.NoError(t, err)
+	// Create a certificate pool
+	rootCertPool := x509.NewCertPool()
+	caCert, err := os.ReadFile("../test/ca/root.cer")
+	require.NoError(t, err)
+	rootCertPool.AppendCertsFromPEM(caCert)
+	// Configure TLS
+	config := &tls.Config{
+		Certificates: []tls.Certificate{cert},
+		ClientAuth:   tls.RequireAndVerifyClientCert,
+		ClientCAs:    rootCertPool,
+	}
+	// Start TLS server
+	ln, err := tls.Listen("tcp", "127.0.0.1:0", config)
+	require.NoError(t, err)
+	go func() {
+		for {
+			conn, err := ln.Accept()
+			if err != nil {
+				return
+			}
+			io.Copy(io.Discard, conn)
+			conn.Close()
+		}
+	}()
+	return ln.Addr().String(), ln.Close
+}
+
+func TestAgent_AddServiceWithTCPTLSCheck(t *testing.T) {
+	t.Parallel()
+	dataDir := testutil.TempDir(t, "agent")
+	a := NewTestAgent(t, `
+		data_dir = "`+dataDir+`"
+		enable_agent_tls_for_checks = true
+		datacenter = "dc1"
+		tls {
+			defaults {
+				ca_file   = "../test/ca/root.cer"
+				cert_file = "../test/key/ourdomain_server.cer"
+				key_file  = "../test/key/ourdomain_server.key"
+			}
+		}
+	`)
+	defer a.Shutdown()
+	testrpc.WaitForTestAgent(t, a.RPC, "dc1")
+	// Start mock TCP+TLS server
+	addr, closeServer := startMockTLSServer(t)
+	defer closeServer()
+	check := &structs.HealthCheck{
+		Node:    "foo",
+		CheckID: "arbitraryTCPServerTLSCheck",
+		Name:    "arbitraryTCPServerTLSCheck",
+		Status:  api.HealthCritical,
+	}
+	chkType := &structs.CheckType{
+		TCP:           addr,
+		TCPUseTLS:     true,
+		TLSServerName: "server.dc1.consul",
+		Interval:      5 * time.Second,
+	}
+	err := a.AddCheck(check, chkType, false, "", ConfigSourceLocal)
+	require.NoError(t, err)
+	// Retry until the healthcheck is passing.
+	retry.Run(t, func(r *retry.R) {
+		status := getCheck(a, "arbitraryTCPServerTLSCheck")
+		if status.Status != api.HealthPassing {
+			r.Fatalf("bad: %v", status.Status)
+		}
+	})
+}
+
 func TestAgent_AddServiceNoExec(t *testing.T) {
 	if testing.Short() {
 		t.Skip("too slow for testing.Short")
@@ -4308,7 +4384,7 @@ func TestAgent_consulConfig_RequestLimits(t *testing.T) {
 
 	t.Parallel()
 	hcl := `
-		limits { 
+		limits {
 			request_limits {
 				mode = "enforcing"
 				read_rate = 8888
@@ -6278,7 +6354,7 @@ func TestAgent_scadaProvider(t *testing.T) {
 		},
 		Overrides: `
 cloud {
-  resource_id = "organization/0b9de9a3-8403-4ca6-aba8-fca752f42100/project/0b9de9a3-8403-4ca6-aba8-fca752f42100/consul.cluster/0b9de9a3-8403-4ca6-aba8-fca752f42100" 
+  resource_id = "organization/0b9de9a3-8403-4ca6-aba8-fca752f42100/project/0b9de9a3-8403-4ca6-aba8-fca752f42100/consul.cluster/0b9de9a3-8403-4ca6-aba8-fca752f42100"
   client_id = "test"
   client_secret = "test"
 }`,

agent/checks/check.go

@@ -625,19 +625,20 @@ func (c *CheckH2PING) Start() {
 	go c.run()
 }
 
-// CheckTCP is used to periodically make an TCP/UDP connection to
-// determine the health of a given check.
+// CheckTCP is used to periodically make a TCP connection to determine the
+// health of a given check.
 // The check is passing if the connection succeeds
 // The check is critical if the connection returns an error
 // Supports failures_before_critical and success_before_passing.
 type CheckTCP struct {
-	CheckID       structs.CheckID
-	ServiceID     structs.ServiceID
-	TCP           string
-	Interval      time.Duration
-	Timeout       time.Duration
-	Logger        hclog.Logger
-	StatusHandler *StatusHandler
+	CheckID         structs.CheckID
+	ServiceID       structs.ServiceID
+	TCP             string
+	Interval        time.Duration
+	Timeout         time.Duration
+	Logger          hclog.Logger
+	TLSClientConfig *tls.Config
+	StatusHandler   *StatusHandler
 
 	dialer   *net.Dialer
 	stop     bool
@@ -694,17 +695,30 @@ func (c *CheckTCP) run() {
 
 // check is invoked periodically to perform the TCP check
 func (c *CheckTCP) check() {
-	conn, err := c.dialer.Dial(`tcp`, c.TCP)
+	var conn io.Closer
+	var err error
+	var checkType string
+
+	if c.TLSClientConfig == nil {
+		conn, err = c.dialer.Dial(`tcp`, c.TCP)
+		checkType = "TCP"
+	} else {
+		conn, err = tls.DialWithDialer(c.dialer, `tcp`, c.TCP, c.TLSClientConfig)
+		checkType = "TCP+TLS"
+	}
+
 	if err != nil {
-		c.Logger.Warn("Check socket connection failed",
+		c.Logger.Warn(fmt.Sprintf("Check %s connection failed", checkType),
 			"check", c.CheckID.String(),
 			"error", err,
 		)
 		c.StatusHandler.updateCheck(c.CheckID, api.HealthCritical, err.Error())
 		return
 	}
+
 	conn.Close()
-	c.StatusHandler.updateCheck(c.CheckID, api.HealthPassing, fmt.Sprintf("TCP connect %s: Success", c.TCP))
+	c.StatusHandler.updateCheck(c.CheckID, api.HealthPassing, fmt.Sprintf("%s connect %s: Success", checkType, c.TCP))
+
 }
 
 // CheckUDP is used to periodically send a UDP datagram to determine the health of a given check.

agent/config/builder.go

@@ -1618,6 +1618,7 @@ func (b *builder) checkVal(v *CheckDefinition) *structs.CheckDefinition {
 		Body:                           stringVal(v.Body),
 		DisableRedirects:               boolVal(v.DisableRedirects),
 		TCP:                            stringVal(v.TCP),
+		TCPUseTLS:                      boolVal(v.TCPUseTLS),
 		UDP:                            stringVal(v.UDP),
 		Interval:                       b.durationVal(fmt.Sprintf("check[%s].interval", id), v.Interval),
 		DockerContainerID:              stringVal(v.DockerContainerID),

agent/config/config.go

@@ -423,6 +423,7 @@ type CheckDefinition struct {
 	DisableRedirects               *bool               `mapstructure:"disable_redirects"`
 	OutputMaxSize                  *int                `mapstructure:"output_max_size"`
 	TCP                            *string             `mapstructure:"tcp"`
+	TCPUseTLS                      *bool               `mapstructure:"tcp_use_tls"`
 	UDP                            *string             `mapstructure:"udp"`
 	Interval                       *string             `mapstructure:"interval"`
 	DockerContainerID              *string             `mapstructure:"docker_container_id" alias:"dockercontainerid"`

agent/config/runtime_test.go

@@ -2357,12 +2357,12 @@ func TestLoad_IntegrationWithFlags(t *testing.T) {
 		},
 		json: []string{`{
 			  "cloud": {
-              	"resource_id": "file-id" 
+              	"resource_id": "file-id"
               }
 			}`},
 		hcl: []string{`
 			  cloud = {
-	            resource_id = "file-id" 
+	            resource_id = "file-id"
 			  }
 			`},
 		expected: func(rt *RuntimeConfig) {
@@ -2529,6 +2529,60 @@ func TestLoad_IntegrationWithFlags(t *testing.T) {
 			rt.DataDir = dataDir
 		},
 	})
+	run(t, testCase{
+		desc: "tcp check with tcp_use_tls set",
+		args: []string{
+			`-data-dir=` + dataDir,
+		},
+		json: []string{
+			`{ "check": { "name": "a", "tcp": "localhost:55555", "tcp_use_tls": true, "interval": "5s" } }`,
+		},
+		hcl: []string{
+			`check = { name = "a" tcp = "localhost:55555" tcp_use_tls = true interval = "5s" }`,
+		},
+		expected: func(rt *RuntimeConfig) {
+			rt.Checks = []*structs.CheckDefinition{
+				{Name: "a", TCP: "localhost:55555", TCPUseTLS: true, OutputMaxSize: checks.DefaultBufSize, Interval: 5 * time.Second},
+			}
+			rt.DataDir = dataDir
+		},
+	})
+	run(t, testCase{
+		desc: "tcp check with tcp_use_tls set to false",
+		args: []string{
+			`-data-dir=` + dataDir,
+		},
+		json: []string{
+			`{ "check": { "name": "a", "tcp": "localhost:55555", "tcp_use_tls": false, "interval": "5s" } }`,
+		},
+		hcl: []string{
+			`check = { name = "a" tcp = "localhost:55555" tcp_use_tls = false interval = "5s" }`,
+		},
+		expected: func(rt *RuntimeConfig) {
+			rt.Checks = []*structs.CheckDefinition{
+				{Name: "a", TCP: "localhost:55555", TCPUseTLS: false, OutputMaxSize: checks.DefaultBufSize, Interval: 5 * time.Second},
+			}
+			rt.DataDir = dataDir
+		},
+	})
+	run(t, testCase{
+		desc: "tcp check with tcp_use_tls not set",
+		args: []string{
+			`-data-dir=` + dataDir,
+		},
+		json: []string{
+			`{ "check": { "name": "a", "tcp": "localhost:55555", "interval": "5s" } }`,
+		},
+		hcl: []string{
+			`check = { name = "a" tcp = "localhost:55555" interval = "5s" }`,
+		},
+		expected: func(rt *RuntimeConfig) {
+			rt.Checks = []*structs.CheckDefinition{
+				{Name: "a", TCP: "localhost:55555", TCPUseTLS: false, OutputMaxSize: checks.DefaultBufSize, Interval: 5 * time.Second},
+			}
+			rt.DataDir = dataDir
+		},
+	})
 	run(t, testCase{
 		desc: "h2ping check without h2ping_use_tls set",
 		args: []string{
@@ -6287,6 +6341,7 @@ func TestLoad_FullConfig(t *testing.T) {
 				Body:                           "wSjTy7dg",
 				DisableRedirects:               true,
 				TCP:                            "RJQND605",
+				TCPUseTLS:                      false,
 				H2PING:                         "9N1cSb5B",
 				H2PingUseTLS:                   false,
 				OSService:                      "aAjE6m9Z",
@@ -6317,6 +6372,7 @@ func TestLoad_FullConfig(t *testing.T) {
 				DisableRedirects:               false,
 				OutputMaxSize:                  checks.DefaultBufSize,
 				TCP:                            "4jG5casb",
+				TCPUseTLS:                      false,
 				H2PING:                         "HCHU7gEb",
 				H2PingUseTLS:                   false,
 				OSService:                      "aqq95BhP",
@@ -6346,6 +6402,7 @@ func TestLoad_FullConfig(t *testing.T) {
 				DisableRedirects:               true,
 				OutputMaxSize:                  checks.DefaultBufSize,
 				TCP:                            "JY6fTTcw",
+				TCPUseTLS:                      false,
 				H2PING:                         "rQ8eyCSF",
 				H2PingUseTLS:                   false,
 				OSService:                      "aZaCAXww",

agent/config/testdata/TestRuntimeConfig_Sanitize.golden

@@ -117,6 +117,7 @@
             "Status": "",
             "SuccessBeforePassing": 0,
             "TCP": "",
+            "TCPUseTLS": false,
             "TLSServerName": "",
             "TLSSkipVerify": false,
             "TTL": "0s",
@@ -368,6 +369,7 @@
                 "Status": "",
                 "SuccessBeforePassing": 0,
                 "TCP": "",
+                "TCPUseTLS": false,
                 "TLSServerName": "",
                 "TLSSkipVerify": false,
                 "TTL": "0s",

agent/structs/check_definition.go

@@ -36,6 +36,7 @@ type CheckDefinition struct {
 	Body                           string
 	DisableRedirects               bool
 	TCP                            string
+	TCPUseTLS                      bool
 	UDP                            string
 	Interval                       time.Duration
 	DockerContainerID              string
@@ -76,6 +77,7 @@ func (t *CheckDefinition) UnmarshalJSON(data []byte) (err error) {
 		DockerContainerIDSnake              string      `json:"docker_container_id"`
 		TLSServerNameSnake                  string      `json:"tls_server_name"`
 		TLSSkipVerifySnake                  bool        `json:"tls_skip_verify"`
+		TCPUseTLSSnake                      bool        `json:"tcp_use_tls"`
 		GRPCUseTLSSnake                     bool        `json:"grpc_use_tls"`
 		ServiceIDSnake                      string      `json:"service_id"`
 		H2PingUseTLSSnake                   bool        `json:"h2ping_use_tls"`
@@ -119,6 +121,9 @@ func (t *CheckDefinition) UnmarshalJSON(data []byte) (err error) {
 	if aux.TLSSkipVerifySnake {
 		t.TLSSkipVerify = aux.TLSSkipVerifySnake
 	}
+	if aux.TCPUseTLSSnake {
+		t.TCPUseTLS = aux.TCPUseTLSSnake
+	}
 	if aux.GRPCUseTLSSnake {
 		t.GRPCUseTLS = aux.GRPCUseTLSSnake
 	}
@@ -220,6 +225,7 @@ func (c *CheckDefinition) CheckType() *CheckType {
 		DisableRedirects:               c.DisableRedirects,
 		OutputMaxSize:                  c.OutputMaxSize,
 		TCP:                            c.TCP,
+		TCPUseTLS:                      c.TCPUseTLS,
 		UDP:                            c.UDP,
 		Interval:                       c.Interval,
 		DockerContainerID:              c.DockerContainerID,

agent/structs/check_type.go

@@ -42,6 +42,7 @@ type CheckType struct {
 	Body                   string
 	DisableRedirects       bool
 	TCP                    string
+	TCPUseTLS              bool
 	UDP                    string
 	Interval               time.Duration
 	AliasNode              string
@@ -87,6 +88,7 @@ func (t *CheckType) UnmarshalJSON(data []byte) (err error) {
 		DockerContainerIDSnake              string      `json:"docker_container_id"`
 		TLSServerNameSnake                  string      `json:"tls_server_name"`
 		TLSSkipVerifySnake                  bool        `json:"tls_skip_verify"`
+		TCPUseTLSSnake                      bool        `json:"tcp_use_tls"`
 		GRPCUseTLSSnake                     bool        `json:"grpc_use_tls"`
 		H2PingUseTLSSnake                   bool        `json:"h2ping_use_tls"`
 
@@ -131,6 +133,9 @@ func (t *CheckType) UnmarshalJSON(data []byte) (err error) {
 	if aux.TLSSkipVerifySnake {
 		t.TLSSkipVerify = aux.TLSSkipVerifySnake
 	}
+	if aux.TCPUseTLSSnake {
+		t.TCPUseTLS = aux.TCPUseTLSSnake
+	}
 	if aux.GRPCUseTLSSnake {
 		t.GRPCUseTLS = aux.GRPCUseTLSSnake
 	}

agent/structs/structs.go

@@ -1879,6 +1879,7 @@ type HealthCheckDefinition struct {
 	Body                           string              `json:",omitempty"`
 	DisableRedirects               bool                `json:",omitempty"`
 	TCP                            string              `json:",omitempty"`
+	TCPUseTLS                      bool                `json:",omitempty"`
 	UDP                            string              `json:",omitempty"`
 	H2PING                         string              `json:",omitempty"`
 	OSService                      string              `json:",omitempty"`
@@ -2031,6 +2032,7 @@ func (c *HealthCheck) CheckType() *CheckType {
 		Body:                           c.Definition.Body,
 		DisableRedirects:               c.Definition.DisableRedirects,
 		TCP:                            c.Definition.TCP,
+		TCPUseTLS:                      c.Definition.TCPUseTLS,
 		UDP:                            c.Definition.UDP,
 		H2PING:                         c.Definition.H2PING,
 		OSService:                      c.Definition.OSService,

agent/txn_endpoint.go

@@ -313,6 +313,7 @@ func (s *HTTPHandlers) convertOps(resp http.ResponseWriter, req *http.Request) (
 							Method:                         check.Definition.Method,
 							Body:                           check.Definition.Body,
 							TCP:                            check.Definition.TCP,
+							TCPUseTLS:                      check.Definition.TCPUseTLS,
 							GRPC:                           check.Definition.GRPC,
 							GRPCUseTLS:                     check.Definition.GRPCUseTLS,
 							OSService:                      check.Definition.OSService,

api/agent.go

@@ -345,6 +345,7 @@ type AgentServiceCheck struct {
 	Method                 string              `json:",omitempty"`
 	Body                   string              `json:",omitempty"`
 	TCP                    string              `json:",omitempty"`
+	TCPUseTLS              bool                `json:",omitempty"`
 	UDP                    string              `json:",omitempty"`
 	Status                 string              `json:",omitempty"`
 	Notes                  string              `json:",omitempty"`

api/health.go

@@ -67,6 +67,7 @@ type HealthCheckDefinition struct {
 	TLSServerName                          string
 	TLSSkipVerify                          bool
 	TCP                                    string
+	TCPUseTLS                              bool
 	UDP                                    string
 	GRPC                                   string
 	OSService                              string

proto/private/pbservice/healthcheck.gen.go

@@ -21,6 +21,7 @@ func CheckTypeToStructs(s *CheckType, t *structs.CheckType) {
 	t.Body = s.Body
 	t.DisableRedirects = s.DisableRedirects
 	t.TCP = s.TCP
+	t.TCPUseTLS = s.TCPUseTLS
 	t.UDP = s.UDP
 	t.Interval = structs.DurationFromProto(s.Interval)
 	t.AliasNode = s.AliasNode
@@ -59,6 +60,7 @@ func CheckTypeFromStructs(t *structs.CheckType, s *CheckType) {
 	s.Body = t.Body
 	s.DisableRedirects = t.DisableRedirects
 	s.TCP = t.TCP
+	s.TCPUseTLS = t.TCPUseTLS
 	s.UDP = t.UDP
 	s.Interval = structs.DurationToProto(t.Interval)
 	s.AliasNode = t.AliasNode
@@ -142,6 +144,7 @@ func HealthCheckDefinitionToStructs(s *HealthCheckDefinition, t *structs.HealthC
 	t.Body = s.Body
 	t.DisableRedirects = s.DisableRedirects
 	t.TCP = s.TCP
+	t.TCPUseTLS = s.TCPUseTLS
 	t.UDP = s.UDP
 	t.H2PING = s.H2PING
 	t.OSService = s.OSService
@@ -171,6 +174,7 @@ func HealthCheckDefinitionFromStructs(t *structs.HealthCheckDefinition, s *Healt
 	s.Body = t.Body
 	s.DisableRedirects = t.DisableRedirects
 	s.TCP = t.TCP
+	s.TCPUseTLS = t.TCPUseTLS
 	s.UDP = t.UDP
 	s.H2PING = t.H2PING
 	s.OSService = t.OSService

proto/private/pbservice/healthcheck.pb.go

@@ -279,6 +279,7 @@ type HealthCheckDefinition struct {
 	Body             string                  `protobuf:"bytes,18,opt,name=Body,proto3" json:"Body,omitempty"`
 	DisableRedirects bool                    `protobuf:"varint,22,opt,name=DisableRedirects,proto3" json:"DisableRedirects,omitempty"`
 	TCP              string                  `protobuf:"bytes,5,opt,name=TCP,proto3" json:"TCP,omitempty"`
+	TCPUseTLS        bool                    `protobuf:"varint,25,opt,name=TCPUseTLS,proto3" json:"TCPUseTLS,omitempty"`
 	UDP              string                  `protobuf:"bytes,23,opt,name=UDP,proto3" json:"UDP,omitempty"`
 	OSService        string                  `protobuf:"bytes,24,opt,name=OSService,proto3" json:"OSService,omitempty"`
 	// mog: func-to=structs.DurationFromProto func-from=structs.DurationToProto
@@ -390,6 +391,13 @@ func (x *HealthCheckDefinition) GetTCP() string {
 	return ""
 }
 
+func (x *HealthCheckDefinition) GetTCPUseTLS() bool {
+	if x != nil {
+		return x.TCPUseTLS
+	}
+	return false
+}
+
 func (x *HealthCheckDefinition) GetUDP() string {
 	if x != nil {
 		return x.UDP
@@ -532,6 +540,7 @@ type CheckType struct {
 	Body             string                  `protobuf:"bytes,26,opt,name=Body,proto3" json:"Body,omitempty"`
 	DisableRedirects bool                    `protobuf:"varint,31,opt,name=DisableRedirects,proto3" json:"DisableRedirects,omitempty"`
 	TCP              string                  `protobuf:"bytes,8,opt,name=TCP,proto3" json:"TCP,omitempty"`
+	TCPUseTLS        bool                    `protobuf:"varint,34,opt,name=TCPUseTLS,proto3" json:"TCPUseTLS,omitempty"`
 	UDP              string                  `protobuf:"bytes,32,opt,name=UDP,proto3" json:"UDP,omitempty"`
 	OSService        string                  `protobuf:"bytes,33,opt,name=OSService,proto3" json:"OSService,omitempty"`
 	// mog: func-to=structs.DurationFromProto func-from=structs.DurationToProto
@@ -677,6 +686,13 @@ func (x *CheckType) GetTCP() string {
 	return ""
 }
 
+func (x *CheckType) GetTCPUseTLS() bool {
+	if x != nil {
+		return x.TCPUseTLS
+	}
+	return false
+}
+
 func (x *CheckType) GetUDP() string {
 	if x != nil {
 		return x.UDP
@@ -884,7 +900,7 @@ var file_private_pbservice_healthcheck_proto_rawDesc = []byte{
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@@ -905,153 +921,157 @@ var file_private_pbservice_healthcheck_proto_rawDesc = []byte{
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 }
 
 var (

proto/private/pbservice/healthcheck.proto

@@ -66,6 +66,7 @@ message HealthCheckDefinition {
   string Body = 18;
   bool DisableRedirects = 22;
   string TCP = 5;
+  bool TCPUseTLS = 25;
   string UDP = 23;
   string OSService = 24;
   // mog: func-to=structs.DurationFromProto func-from=structs.DurationToProto
@@ -117,6 +118,7 @@ message CheckType {
   string Body = 26;
   bool DisableRedirects = 31;
   string TCP = 8;
+  bool TCPUseTLS = 34;
   string UDP = 32;
   string OSService = 33;
   // mog: func-to=structs.DurationFromProto func-from=structs.DurationToProto

website/content/api-docs/agent/check.mdx

@@ -239,6 +239,10 @@ The table below shows this endpoint's support for
   made to both addresses, and the first successful connection attempt will
   result in a successful check.
 
+- `TCPUseTLS` `(bool: false)` - Specifies whether to use TLS for this `TCP` health check.
+  If TLS is enabled, then by default, a valid TLS certificate is expected. Certificate
+  verification can be turned off by setting `TLSSkipVerify` to `true`.
+
 - `UDP` `(string: "")` - Specifies a `UDP` IP address/hostname and port.
 The check sends datagrams to the value specified at the interval specified in the `Interval` configuration.
 If the datagram is sent successfully or a timeout is returned, the check is set to the `passing` state.

website/content/docs/dynamic-app-config/watches.mdx

@@ -535,6 +535,7 @@ An example of the output of this command:
           "TLSServerName": "",
           "TLSSkipVerify": false,
           "TCP": "",
+          "TCPUseTLS": false,
           "GRPC": "",
           "GRPCUseTLS": false
         },

website/content/docs/ecs/configuration-reference.mdx

@@ -189,9 +189,10 @@ Defines the Consul checks for the service. Each `check` object may contain the f
 | `status` | `string` | optional | Specifies the initial status the health check. Must be one of `passing`, `warning`, `critical`, `maintenance`, or `null`. |
 | `successBeforePassing` | `integer` | optional | Specifies the number of consecutive successful results required before check status transitions to passing.  |
 | `tcp` | `string` | optional | Specifies this is a TCP check. Must be an IP/hostname plus port to which a TCP connection is made every `interval`.  |
+| `tcpUseTls` | `boolean` | optional | Specifies whether to use TLS for this `TCP` health check. If TLS is enabled, then by default, a valid TLS certificate is expected. Certificate verification can be disabled by setting `TLSSkipVerify` to `true`.  |
 | `timeout` | `string` | optional | Specifies a timeout for outgoing connections. Applies to script, HTTP, TCP, UDP, and gRPC checks. Must be a duration string, such as `10s` or `5m`.  |
 | `tlsServerName` | `string` | optional | Specifies an optional string used to set the SNI host when connecting via TLS.  |
-| `tlsSkipVerify` | `boolean` | optional | Specifies if the certificate for an HTTPS check should not be verified.  |
+| `tlsSkipVerify` | `boolean` | optional | Specifies if the check should verify the chain and hostname of the certificate presented by the server being checked. Set to `true` to disable verification. We recommend setting to `false` for production use. Default is `false`. Supported check types: `HTTP`, `H2Ping`, `gRPC`, and `TCP`|
 | `ttl` | `string` | optional | Specifies this is a TTL check. Must be a duration string, such as `10s` or `5m`.  |
 | `udp` | `string` | optional | Specifies this is a UDP check. Must be an IP/hostname plus port to which UDP datagrams are sent every `interval`.  |
 

website/content/docs/services/configuration/checks-configuration-reference.mdx

@@ -36,7 +36,7 @@ Specify health check options in the `check` block. To register two or more heath
 | `h2ping_use_tls` | Boolean value that enables TLS for H2ping checks when set to `true`. | <li>H2ping</li> |
 | `http` | String value that specifies an HTTP endpoint to send requests to. | <li>HTTP</li> |
 | `tls_server_name` | String value that specifies the server name used to verify the hostname on the returned certificates unless `tls_skip_verify` is given. Also included in the client's handshake to support SNI. It is recommended that this field be left unspecified. The TLS client will deduce the server name for SNI from the check address unless it's an IP ([RFC 6066, Section 3](https://tools.ietf.org/html/rfc6066#section-3)). There are two common circumstances where supplying a `tls_server_name` can be beneficial: <li>When the check address is an IP, `tls_server_name` can be specified for SNI. Note: setting `tls_server_name` will also override the hostname used to verify the certificate presented by the server being checked.</li><li>When the hostname in the check address won't be present in the SAN (Subject Alternative Name) field of the certificate presented by the server being checked. Note: setting `tls_server_name` will also override the hostname used for SNI.</li> | <li>HTTP </li> <li>H2Ping </li> <li>gRPC </li> |
-| `tls_skip_verify` | Boolean value that determines if the check verifies the chain and hostname of the certificate that the server presents. Set to `true` to disable verification. We recommend setting to `false` for production use. Default is `false`. | <li>HTTP </li> <li>H2Ping </li> <li>gRPC </li> |
+| `tls_skip_verify` | Boolean value that determines if the check verifies the chain and hostname of the certificate that the server presents. Set to `true` to disable verification. We recommend setting to `false` for production use. Default is `false`. | <li>HTTP </li> <li>H2Ping </li> <li>gRPC </li> <li>TCP </li> |
 | `method` | String value that specifies the request method to send during HTTP checks. Default is `GET`. | <li>HTTP</li> |
 | `header` | Object that specifies header fields to send in HTTP check requests. Each header specified in `header` object contains a list of string values. | <li>HTTP</li> |
 | `body` | String value that contains JSON attributes to send in HTTP check requests. You must escape the quotation marks around the keys and values for each attribute. | <li>HTTP</li> |
@@ -44,6 +44,7 @@ Specify health check options in the `check` block. To register two or more heath
 | `os_service` | String value that specifies the name of the name of a service to check during an OSService check. | <li>OSService</li> |
 | `service_id` | String value that specifies the ID of a service instance to associate with an OSService check. That service instance must be on the same node as the check. If not specified, the check verifies the health of the node. | <li>OSService</li> |
 | `tcp` | String value that specifies an IP address or host and port number for the check establish a TCP connection with. | <li>TCP</li> |
+| `tcp_use_tls` | Boolean value that enables TLS for TCP checks when set to `true`. | <li>TCP </li> |
 | `udp` | String value that specifies an IP address or host and port number for the check to send UDP datagrams to. | <li>UDP</li> |
 | `ttl` | String value that specifies how long to wait for an update from an external process during a TTL check. | <li>TTL</li> |
 | `alias_service` | String value that specifies a service or node that the service associated with the health check aliases. | <li>Alias</li> |
@@ -52,4 +53,3 @@ Specify health check options in the `check` block. To register two or more heath
 
 ## Checks block
 You can define multiple health checks in a single `checks` block. The `checks` block is an array of objects that contain the configuration options described in the [`check` block configuration reference](#check-block).
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