Pull request 2382: AGDNS-2714-tls-config

Merge in DNS/adguard-home from AGDNS-2714-tls-config to master Squashed commit of the following: commit 073e5ec367db02690e9527602a1da6bfd29321a0 Merge: 18f38c9d4 4d258972d Author: Stanislav Chzhen <s.chzhen@adguard.com> Date: Wed Apr 16 18:25:23 2025 +0300 Merge branch 'master' into AGDNS-2714-tls-config commit 18f38c9d44337752c6d0f09142658f374de0979f Author: Stanislav Chzhen <s.chzhen@adguard.com> Date: Fri Apr 11 15:02:00 2025 +0300 dnsforward: imp docs commit ed56d3c2bc239bdc9af000d847721c4c43d173a3 Merge: 3ef281ea2 1cc6c00e4 Author: Stanislav Chzhen <s.chzhen@adguard.com> Date: Thu Apr 10 17:25:08 2025 +0300 Merge branch 'master' into AGDNS-2714-tls-config commit 3ef281ea28dc1fcab0a1291fb3221e6324077a10 Author: Stanislav Chzhen <s.chzhen@adguard.com> Date: Thu Apr 10 17:24:29 2025 +0300 all: imp docs commit b75f2874a816d4814d218c3b062d532f02e26ca5 Author: Stanislav Chzhen <s.chzhen@adguard.com> Date: Mon Apr 7 17:16:59 2025 +0300 dnsforward: imp code commit 8ab17b96bca957a172062faaa23b72d5c7ed4d0d Author: Stanislav Chzhen <s.chzhen@adguard.com> Date: Fri Apr 4 21:26:37 2025 +0300 all: imp code commit 1abce97b50fe0406dd1ec85b96a0f99b633325cc Author: Stanislav Chzhen <s.chzhen@adguard.com> Date: Wed Apr 2 18:22:15 2025 +0300 home: imp code commit debf710f4ebbdfe3e4d2f15b1adcf6b86f8dfc0d Author: Stanislav Chzhen <s.chzhen@adguard.com> Date: Tue Apr 1 14:52:21 2025 +0300 home: imp code commit 4aa26f15b721f2a3f32da29b3f664a02bc5a8608 Author: Stanislav Chzhen <s.chzhen@adguard.com> Date: Tue Apr 1 14:16:16 2025 +0300 all: imp code commit 1a3e72f7a1276f9f797caf9b615f8a552cc9e988 Author: Stanislav Chzhen <s.chzhen@adguard.com> Date: Mon Mar 31 21:22:40 2025 +0300 all: imp code commit 776ab824aef18ea27b59c02ebfc8620c715a867e Author: Stanislav Chzhen <s.chzhen@adguard.com> Date: Thu Mar 27 14:00:33 2025 +0300 home: tls config mu commit 9ebf912f530181043df5c583e82291484996429a Author: Stanislav Chzhen <s.chzhen@adguard.com> Date: Wed Mar 26 18:58:47 2025 +0300 all: tls config
2025-04-16 18:57:04 +03:00
parent 4d258972d1
commit 3521e8ed9f
21 changed files with 412 additions and 293 deletions
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -64,6 +64,8 @@ See also the [v0.107.59 GitHub milestone][ms-v0.107.59].

 ### Fixed

+- Validation process for the DNS-over-TLS, DNS-over-QUIC, and HTTPS ports on the *Encryption Settings* page.
+
 - Rules with the `client` modifier not working ([#7708]).

 - The search form not working in the query log ([#7704]).
--- a/internal/dnsforward/beforerequest.go
+++ b/internal/dnsforward/beforerequest.go
@@ -74,7 +74,7 @@ func (s *Server) clientIDFromDNSContext(pctx *proxy.DNSContext) (clientID string
 		return "", nil
 	}

-	hostSrvName := s.conf.ServerName
+	hostSrvName := s.conf.TLSConf.ServerName
 	if hostSrvName == "" {
 		return "", nil
 	}
@@ -87,7 +87,7 @@ func (s *Server) clientIDFromDNSContext(pctx *proxy.DNSContext) (clientID string
 	clientID, err = clientIDFromClientServerName(
 		hostSrvName,
 		cliSrvName,
-		s.conf.StrictSNICheck,
+		s.conf.TLSConf.StrictSNICheck,
 	)
 	if err != nil {
 		return "", fmt.Errorf("clientid check: %w", err)
--- a/internal/dnsforward/beforerequest_internal_test.go
+++ b/internal/dnsforward/beforerequest_internal_test.go
@@ -121,7 +121,7 @@ func TestServer_HandleBefore_tls(t *testing.T) {
 		t.Run(tc.name, func(t *testing.T) {
 			t.Parallel()

-			s, _ := createTestTLS(t, TLSConfig{
+			s, _ := createTestTLS(t, &TLSConfig{
 				TLSListenAddrs: []*net.TCPAddr{{}},
 				ServerName:     tlsServerName,
 			})
@@ -259,6 +259,7 @@ func TestServer_HandleBefore_udp(t *testing.T) {
 			}, ServerConfig{
 				UDPListenAddrs: []*net.UDPAddr{{}},
 				TCPListenAddrs: []*net.TCPAddr{{}},
+				TLSConf:        &TLSConfig{},
 				Config: Config{
 					AllowedClients:    tc.allowedClients,
 					DisallowedClients: tc.disallowedClients,
--- a/internal/dnsforward/clientid_internal_test.go
+++ b/internal/dnsforward/clientid_internal_test.go
@@ -212,13 +212,13 @@ func TestServer_clientIDFromDNSContext(t *testing.T) {

 	for _, tc := range testCases {
 		t.Run(tc.name, func(t *testing.T) {
-			tlsConf := TLSConfig{
+			tlsConf := &TLSConfig{
 				ServerName:     tc.confSrvName,
 				StrictSNICheck: tc.strictSNI,
 			}

 			srv := &Server{
-				conf:       ServerConfig{TLSConfig: tlsConf},
+				conf:       ServerConfig{TLSConf: tlsConf},
 				baseLogger: slogutil.NewDiscardLogger(),
 			}

--- a/internal/dnsforward/config.go
+++ b/internal/dnsforward/config.go
@@ -11,7 +11,6 @@ import (
 	"strings"
 	"time"

-	"github.com/AdguardTeam/AdGuardHome/internal/aghalg"
 	"github.com/AdguardTeam/AdGuardHome/internal/aghhttp"
 	"github.com/AdguardTeam/AdGuardHome/internal/aghnet"
 	"github.com/AdguardTeam/AdGuardHome/internal/aghtls"
@@ -168,43 +167,34 @@ type EDNSClientSubnet struct {
 	UseCustom bool `yaml:"use_custom"`
 }

-// TLSConfig is the TLS configuration for HTTPS, DNS-over-HTTPS, and DNS-over-TLS
+// TLSConfig contains the TLS configuration settings for DNS-over-HTTPS (DoH),
+// DNS-over-TLS (DoT), DNS-over-QUIC (DoQ), and Discovery of Designated
+// Resolvers (DDR).
 type TLSConfig struct {
-	cert tls.Certificate
+	// Cert is the TLS certificate used for TLS connections.  It is nil if
+	// encryption is disabled.
+	Cert *tls.Certificate

-	TLSListenAddrs   []*net.TCPAddr `yaml:"-" json:"-"`
-	QUICListenAddrs  []*net.UDPAddr `yaml:"-" json:"-"`
-	HTTPSListenAddrs []*net.TCPAddr `yaml:"-" json:"-"`
+	// TLSListenAddrs are the addresses to listen on for DoT connections.  Each
+	// item in the list must be non-nil if Cert is not nil.
+	TLSListenAddrs []*net.TCPAddr

-	// PEM-encoded certificates chain
-	CertificateChain string `yaml:"certificate_chain" json:"certificate_chain"`
-	// PEM-encoded private key
-	PrivateKey string `yaml:"private_key" json:"private_key"`
+	// QUICListenAddrs are the addresses to listen on for DoQ connections.  Each
+	// item in the list must be non-nil if Cert is not nil.
+	QUICListenAddrs []*net.UDPAddr

-	CertificatePath string `yaml:"certificate_path" json:"certificate_path"`
-	PrivateKeyPath  string `yaml:"private_key_path" json:"private_key_path"`
-
-	CertificateChainData []byte `yaml:"-" json:"-"`
-	PrivateKeyData       []byte `yaml:"-" json:"-"`
+	// HTTPSListenAddrs should be the addresses AdGuard Home is listening on for
+	// DoH connections.  These addresses are announced with DDR.  Each item in
+	// the list must be non-nil.
+	HTTPSListenAddrs []*net.TCPAddr

 	// ServerName is the hostname of the server.  Currently, it is only being
 	// used for ClientID checking and Discovery of Designated Resolvers (DDR).
-	ServerName string `yaml:"-" json:"-"`
-
-	// DNS names from certificate (SAN) or CN value from Subject
-	dnsNames []string
-
-	// OverrideTLSCiphers, when set, contains the names of the cipher suites to
-	// use.  If the slice is empty, the default safe suites are used.
-	OverrideTLSCiphers []string `yaml:"override_tls_ciphers,omitempty" json:"-"`
+	ServerName string

 	// StrictSNICheck controls if the connections with SNI mismatching the
 	// certificate's ones should be rejected.
-	StrictSNICheck bool `yaml:"strict_sni_check" json:"-"`
-
-	// hasIPAddrs is set during the certificate parsing and is true if the
-	// configured certificate contains at least a single IP address.
-	hasIPAddrs bool
+	StrictSNICheck bool
 }

 // DNSCryptConfig is the DNSCrypt server configuration struct.
@@ -239,8 +229,11 @@ type ServerConfig struct {
 	// Remove that.
 	AddrProcConf *client.DefaultAddrProcConfig

+	// TLSConf is the TLS configuration for DNS-over-TLS, DNS-over-QUIC, and
+	// HTTPS.  It must not be nil.
+	TLSConf *TLSConfig
+
 	Config
-	TLSConfig
 	DNSCryptConfig
 	TLSAllowUnencryptedDoH bool

@@ -608,45 +601,33 @@ func (conf *ServerConfig) ourAddrsSet() (m addrPortSet, err error) {
 	}
 }

-// prepareTLS - prepares TLS configuration for the DNS proxy
+// prepareTLS sets up the TLS configuration for the DNS proxy.
 func (s *Server) prepareTLS(proxyConfig *proxy.Config) (err error) {
-	if len(s.conf.CertificateChainData) == 0 || len(s.conf.PrivateKeyData) == 0 {
+	if s.conf.TLSConf.Cert == nil {
+		return
+	}
+
+	if s.conf.TLSConf.TLSListenAddrs == nil && s.conf.TLSConf.QUICListenAddrs == nil {
 		return nil
 	}

-	if s.conf.TLSListenAddrs == nil && s.conf.QUICListenAddrs == nil {
-		return nil
-	}
+	proxyConfig.TLSListenAddr = s.conf.TLSConf.TLSListenAddrs
+	proxyConfig.QUICListenAddr = s.conf.TLSConf.QUICListenAddrs

-	proxyConfig.TLSListenAddr = aghalg.CoalesceSlice(
-		s.conf.TLSListenAddrs,
-		proxyConfig.TLSListenAddr,
-	)
-
-	proxyConfig.QUICListenAddr = aghalg.CoalesceSlice(
-		s.conf.QUICListenAddrs,
-		proxyConfig.QUICListenAddr,
-	)
-
-	s.conf.cert, err = tls.X509KeyPair(s.conf.CertificateChainData, s.conf.PrivateKeyData)
-	if err != nil {
-		return fmt.Errorf("failed to parse TLS keypair: %w", err)
-	}
-
-	cert, err := x509.ParseCertificate(s.conf.cert.Certificate[0])
+	cert, err := x509.ParseCertificate(s.conf.TLSConf.Cert.Certificate[0])
 	if err != nil {
 		return fmt.Errorf("x509.ParseCertificate(): %w", err)
 	}

-	s.conf.hasIPAddrs = aghtls.CertificateHasIP(cert)
+	s.hasIPAddrs = aghtls.CertificateHasIP(cert)

-	if s.conf.StrictSNICheck {
+	if s.conf.TLSConf.StrictSNICheck {
 		if len(cert.DNSNames) != 0 {
-			s.conf.dnsNames = cert.DNSNames
+			s.dnsNames = cert.DNSNames
 			log.Debug("dns: using certificate's SAN as DNS names: %v", cert.DNSNames)
-			slices.Sort(s.conf.dnsNames)
+			slices.Sort(s.dnsNames)
 		} else {
-			s.conf.dnsNames = append(s.conf.dnsNames, cert.Subject.CommonName)
+			s.dnsNames = []string{cert.Subject.CommonName}
 			log.Debug("dns: using certificate's CN as DNS name: %s", cert.Subject.CommonName)
 		}
 	}
@@ -695,11 +676,11 @@ func anyNameMatches(dnsNames []string, sni string) (ok bool) {
 // Called by 'tls' package when Client Hello is received
 // If the server name (from SNI) supplied by client is incorrect - we terminate the ongoing TLS handshake.
 func (s *Server) onGetCertificate(ch *tls.ClientHelloInfo) (*tls.Certificate, error) {
-	if s.conf.StrictSNICheck && !anyNameMatches(s.conf.dnsNames, ch.ServerName) {
+	if s.conf.TLSConf.StrictSNICheck && !anyNameMatches(s.dnsNames, ch.ServerName) {
 		log.Info("dns: tls: unknown SNI in Client Hello: %s", ch.ServerName)
 		return nil, fmt.Errorf("invalid SNI")
 	}
-	return &s.conf.cert, nil
+	return s.conf.TLSConf.Cert, nil
 }

 // preparePlain prepares the plain-DNS configuration for the DNS proxy.
--- a/internal/dnsforward/dns64_internal_test.go
+++ b/internal/dnsforward/dns64_internal_test.go
@@ -296,6 +296,7 @@ func TestServer_HandleDNSRequest_dns64(t *testing.T) {
 				UDPListenAddrs: []*net.UDPAddr{{}},
 				TCPListenAddrs: []*net.TCPAddr{{}},
 				UseDNS64:       true,
+				TLSConf:        &TLSConfig{},
 				Config: Config{
 					UpstreamMode:     UpstreamModeLoadBalance,
 					EDNSClientSubnet: &EDNSClientSubnet{Enabled: false},
@@ -335,6 +336,7 @@ func TestServer_dns64WithDisabledRDNS(t *testing.T) {
 		UDPListenAddrs: []*net.UDPAddr{{}},
 		TCPListenAddrs: []*net.TCPAddr{{}},
 		UseDNS64:       true,
+		TLSConf:        &TLSConfig{},
 		Config: Config{
 			UpstreamMode:     UpstreamModeLoadBalance,
 			EDNSClientSubnet: &EDNSClientSubnet{Enabled: false},
--- a/internal/dnsforward/dnsforward.go
+++ b/internal/dnsforward/dnsforward.go
@@ -103,16 +103,26 @@ type SystemResolvers interface {
 //
 // The zero Server is empty and ready for use.
 type Server struct {
-	// dnsProxy is the DNS proxy for forwarding client's DNS requests.
-	dnsProxy *proxy.Proxy
+	// addrProc, if not nil, is used to process clients' IP addresses with rDNS,
+	// WHOIS, etc.
+	addrProc client.AddressProcessor

-	// dnsFilter is the DNS filter for filtering client's DNS requests and
-	// responses.
-	dnsFilter *filtering.DNSFilter
+	// bootstrap is the resolver for upstreams' hostnames.
+	bootstrap upstream.Resolver
+
+	// clientIDCache is a temporary storage for ClientIDs that were extracted
+	// during the BeforeRequestHandler stage.
+	clientIDCache cache.Cache

 	// dhcpServer is the DHCP server for accessing lease data.
 	dhcpServer DHCP

+	// etcHosts contains the current data from the system's hosts files.
+	etcHosts upstream.Resolver
+
+	// privateNets is the configured set of IP networks considered private.
+	privateNets netutil.SubnetSet
+
 	// queryLog is the query log for client's DNS requests, responses and
 	// filtering results.
 	queryLog querylog.QueryLog
@@ -120,37 +130,43 @@ type Server struct {
 	// stats is the statistics collector for client's DNS usage data.
 	stats stats.Interface

+	// sysResolvers used to fetch system resolvers to use by default for private
+	// PTR resolving.
+	sysResolvers SystemResolvers
+
 	// access drops disallowed clients.
 	access *accessManager

+	// anonymizer masks the client's IP addresses if needed.
+	anonymizer *aghnet.IPMut
+
 	// baseLogger is used to create loggers for other entities.  It should not
 	// have a prefix and must not be nil.
 	baseLogger *slog.Logger

-	// localDomainSuffix is the suffix used to detect internal hosts.  It
-	// must be a valid domain name plus dots on each side.
-	localDomainSuffix string
+	// dnsFilter is the DNS filter for filtering client's DNS requests and
+	// responses.
+	dnsFilter *filtering.DNSFilter
+
+	// dnsProxy is the DNS proxy for forwarding client's DNS requests.
+	dnsProxy *proxy.Proxy
+
+	// internalProxy resolves internal requests from the application itself.  It
+	// isn't started and so no listen ports are required.
+	internalProxy *proxy.Proxy

 	// ipset processes DNS requests using ipset data.  It must not be nil after
 	// initialization.  See [newIpsetHandler].
 	ipset *ipsetHandler

-	// privateNets is the configured set of IP networks considered private.
-	privateNets netutil.SubnetSet
+	// dns64Pref is the NAT64 prefix used for DNS64 response mapping.  The major
+	// part of DNS64 happens inside the [proxy] package, but there still are
+	// some places where response mapping is needed (e.g. DHCP).
+	dns64Pref netip.Prefix

-	// addrProc, if not nil, is used to process clients' IP addresses with rDNS,
-	// WHOIS, etc.
-	addrProc client.AddressProcessor
-
-	// sysResolvers used to fetch system resolvers to use by default for private
-	// PTR resolving.
-	sysResolvers SystemResolvers
-
-	// etcHosts contains the current data from the system's hosts files.
-	etcHosts upstream.Resolver
-
-	// bootstrap is the resolver for upstreams' hostnames.
-	bootstrap upstream.Resolver
+	// localDomainSuffix is the suffix used to detect internal hosts.  It
+	// must be a valid domain name plus dots on each side.
+	localDomainSuffix string

 	// bootResolvers are the resolvers that should be used for
 	// bootstrapping along with [etcHosts].
@@ -159,34 +175,26 @@ type Server struct {
 	// [upstream.Resolver] interface.
 	bootResolvers []*upstream.UpstreamResolver

-	// dns64Pref is the NAT64 prefix used for DNS64 response mapping.  The major
-	// part of DNS64 happens inside the [proxy] package, but there still are
-	// some places where response mapping is needed (e.g. DHCP).
-	dns64Pref netip.Prefix
-
-	// anonymizer masks the client's IP addresses if needed.
-	anonymizer *aghnet.IPMut
-
-	// clientIDCache is a temporary storage for ClientIDs that were extracted
-	// during the BeforeRequestHandler stage.
-	clientIDCache cache.Cache
-
-	// internalProxy resolves internal requests from the application itself.  It
-	// isn't started and so no listen ports are required.
-	internalProxy *proxy.Proxy
-
-	// isRunning is true if the DNS server is running.
-	isRunning bool
-
-	// protectionUpdateInProgress is used to make sure that only one goroutine
-	// updating the protection configuration after a pause is running at a time.
-	protectionUpdateInProgress atomic.Bool
+	// dnsNames are the DNS names from certificate (SAN) or CN value from
+	// Subject.
+	dnsNames []string

 	// conf is the current configuration of the server.
 	conf ServerConfig

 	// serverLock protects Server.
 	serverLock sync.RWMutex
+
+	// protectionUpdateInProgress is used to make sure that only one goroutine
+	// updating the protection configuration after a pause is running at a time.
+	protectionUpdateInProgress atomic.Bool
+
+	// isRunning is true if the DNS server is running.
+	isRunning bool
+
+	// hasIPAddrs is set during the certificate parsing and is true if the
+	// configured certificate contains at least a single IP address.
+	hasIPAddrs bool
 }

 // defaultLocalDomainSuffix is the default suffix used to detect internal hosts
--- a/internal/dnsforward/dnsforward_internal_test.go
+++ b/internal/dnsforward/dnsforward_internal_test.go
@@ -213,17 +213,23 @@ func createServerTLSConfig(t *testing.T) (*tls.Config, []byte, []byte) {
 	}, certPem, keyPem
 }

-func createTestTLS(t *testing.T, tlsConf TLSConfig) (s *Server, certPem []byte) {
+func createTestTLS(t *testing.T, tlsConf *TLSConfig) (s *Server, certPem []byte) {
 	t.Helper()

 	var keyPem []byte
 	_, certPem, keyPem = createServerTLSConfig(t)

+	cert, err := tls.X509KeyPair(certPem, keyPem)
+	require.NoError(t, err)
+
+	tlsConf.Cert = &cert
+
 	s = createTestServer(t, &filtering.Config{
 		BlockingMode: filtering.BlockingModeDefault,
 	}, ServerConfig{
 		UDPListenAddrs: []*net.UDPAddr{{}},
 		TCPListenAddrs: []*net.TCPAddr{{}},
+		TLSConf:        tlsConf,
 		Config: Config{
 			UpstreamMode:     UpstreamModeLoadBalance,
 			EDNSClientSubnet: &EDNSClientSubnet{Enabled: false},
@@ -232,10 +238,7 @@ func createTestTLS(t *testing.T, tlsConf TLSConfig) (s *Server, certPem []byte)
 		ServePlainDNS: true,
 	})

-	tlsConf.CertificateChainData, tlsConf.PrivateKeyData = certPem, keyPem
-	s.conf.TLSConfig = tlsConf
-
-	err := s.Prepare(&s.conf)
+	err = s.Prepare(&s.conf)
 	require.NoErrorf(t, err, "failed to prepare server: %s", err)

 	return s, certPem
@@ -354,6 +357,7 @@ func TestServer(t *testing.T) {
 	}, ServerConfig{
 		UDPListenAddrs: []*net.UDPAddr{{}},
 		TCPListenAddrs: []*net.TCPAddr{{}},
+		TLSConf:        &TLSConfig{},
 		Config: Config{
 			UpstreamMode:     UpstreamModeLoadBalance,
 			EDNSClientSubnet: &EDNSClientSubnet{Enabled: false},
@@ -395,6 +399,7 @@ func TestServer_timeout(t *testing.T) {
 	t.Run("custom", func(t *testing.T) {
 		srvConf := &ServerConfig{
 			UpstreamTimeout: testTimeout,
+			TLSConf:         &TLSConfig{},
 			Config: Config{
 				UpstreamMode:     UpstreamModeLoadBalance,
 				EDNSClientSubnet: &EDNSClientSubnet{Enabled: false},
@@ -422,6 +427,7 @@ func TestServer_timeout(t *testing.T) {
 		})
 		require.NoError(t, err)

+		s.conf.TLSConf = &TLSConfig{}
 		s.conf.Config.UpstreamMode = UpstreamModeLoadBalance
 		s.conf.Config.EDNSClientSubnet = &EDNSClientSubnet{
 			Enabled: false,
@@ -436,6 +442,7 @@ func TestServer_timeout(t *testing.T) {

 func TestServer_Prepare_fallbacks(t *testing.T) {
 	srvConf := &ServerConfig{
+		TLSConf: &TLSConfig{},
 		Config: Config{
 			FallbackDNS: []string{
 				"#tls://1.1.1.1",
@@ -466,6 +473,7 @@ func TestServerWithProtectionDisabled(t *testing.T) {
 	}, ServerConfig{
 		UDPListenAddrs: []*net.UDPAddr{{}},
 		TCPListenAddrs: []*net.TCPAddr{{}},
+		TLSConf:        &TLSConfig{},
 		Config: Config{
 			UpstreamMode:     UpstreamModeLoadBalance,
 			EDNSClientSubnet: &EDNSClientSubnet{Enabled: false},
@@ -487,7 +495,7 @@ func TestServerWithProtectionDisabled(t *testing.T) {
 }

 func TestDoTServer(t *testing.T) {
-	s, certPem := createTestTLS(t, TLSConfig{
+	s, certPem := createTestTLS(t, &TLSConfig{
 		TLSListenAddrs: []*net.TCPAddr{{}},
 	})
 	s.conf.UpstreamConfig.Upstreams = []upstream.Upstream{newGoogleUpstream()}
@@ -511,7 +519,7 @@ func TestDoTServer(t *testing.T) {
 }

 func TestDoQServer(t *testing.T) {
-	s, _ := createTestTLS(t, TLSConfig{
+	s, _ := createTestTLS(t, &TLSConfig{
 		QUICListenAddrs: []*net.UDPAddr{{IP: net.IP{127, 0, 0, 1}}},
 	})
 	s.conf.UpstreamConfig.Upstreams = []upstream.Upstream{newGoogleUpstream()}
@@ -596,6 +604,7 @@ func TestSafeSearch(t *testing.T) {
 	forwardConf := ServerConfig{
 		UDPListenAddrs: []*net.UDPAddr{{}},
 		TCPListenAddrs: []*net.TCPAddr{{}},
+		TLSConf:        &TLSConfig{},
 		Config: Config{
 			UpstreamMode: UpstreamModeLoadBalance,
 			EDNSClientSubnet: &EDNSClientSubnet{
@@ -690,6 +699,7 @@ func TestInvalidRequest(t *testing.T) {
 	}, ServerConfig{
 		UDPListenAddrs: []*net.UDPAddr{{}},
 		TCPListenAddrs: []*net.TCPAddr{{}},
+		TLSConf:        &TLSConfig{},
 		Config: Config{
 			UpstreamMode: UpstreamModeLoadBalance,
 			EDNSClientSubnet: &EDNSClientSubnet{
@@ -721,6 +731,7 @@ func TestBlockedRequest(t *testing.T) {
 	forwardConf := ServerConfig{
 		UDPListenAddrs: []*net.UDPAddr{{}},
 		TCPListenAddrs: []*net.TCPAddr{{}},
+		TLSConf:        &TLSConfig{},
 		Config: Config{
 			UpstreamMode: UpstreamModeLoadBalance,
 			EDNSClientSubnet: &EDNSClientSubnet{
@@ -758,6 +769,7 @@ func TestServerCustomClientUpstream(t *testing.T) {
 	forwardConf := ServerConfig{
 		UDPListenAddrs: []*net.UDPAddr{{}},
 		TCPListenAddrs: []*net.TCPAddr{{}},
+		TLSConf:        &TLSConfig{},
 		Config: Config{
 			CacheSize:    defaultCacheSize,
 			UpstreamMode: UpstreamModeLoadBalance,
@@ -838,6 +850,7 @@ func TestBlockCNAMEProtectionEnabled(t *testing.T) {
 	}, ServerConfig{
 		UDPListenAddrs: []*net.UDPAddr{{}},
 		TCPListenAddrs: []*net.TCPAddr{{}},
+		TLSConf:        &TLSConfig{},
 		Config: Config{
 			UpstreamMode: UpstreamModeLoadBalance,
 			EDNSClientSubnet: &EDNSClientSubnet{
@@ -873,6 +886,7 @@ func TestBlockCNAME(t *testing.T) {
 	forwardConf := ServerConfig{
 		UDPListenAddrs: []*net.UDPAddr{{}},
 		TCPListenAddrs: []*net.TCPAddr{{}},
+		TLSConf:        &TLSConfig{},
 		Config: Config{
 			UpstreamMode: UpstreamModeLoadBalance,
 			EDNSClientSubnet: &EDNSClientSubnet{
@@ -947,6 +961,7 @@ func TestClientRulesForCNAMEMatching(t *testing.T) {
 	forwardConf := ServerConfig{
 		UDPListenAddrs: []*net.UDPAddr{{}},
 		TCPListenAddrs: []*net.TCPAddr{{}},
+		TLSConf:        &TLSConfig{},
 		Config: Config{
 			UpstreamMode: UpstreamModeLoadBalance,
 			EDNSClientSubnet: &EDNSClientSubnet{
@@ -994,6 +1009,7 @@ func TestNullBlockedRequest(t *testing.T) {
 	forwardConf := ServerConfig{
 		UDPListenAddrs: []*net.UDPAddr{{}},
 		TCPListenAddrs: []*net.TCPAddr{{}},
+		TLSConf:        &TLSConfig{},
 		Config: Config{
 			UpstreamMode: UpstreamModeLoadBalance,
 			EDNSClientSubnet: &EDNSClientSubnet{
@@ -1064,6 +1080,7 @@ func TestBlockedCustomIP(t *testing.T) {
 	conf := &ServerConfig{
 		UDPListenAddrs: []*net.UDPAddr{{}},
 		TCPListenAddrs: []*net.TCPAddr{{}},
+		TLSConf:        &TLSConfig{},
 		Config: Config{
 			UpstreamDNS:  []string{"8.8.8.8:53", "8.8.4.4:53"},
 			UpstreamMode: UpstreamModeLoadBalance,
@@ -1119,6 +1136,7 @@ func TestBlockedByHosts(t *testing.T) {
 	forwardConf := ServerConfig{
 		UDPListenAddrs: []*net.UDPAddr{{}},
 		TCPListenAddrs: []*net.TCPAddr{{}},
+		TLSConf:        &TLSConfig{},
 		Config: Config{
 			UpstreamMode: UpstreamModeLoadBalance,
 			EDNSClientSubnet: &EDNSClientSubnet{
@@ -1172,6 +1190,7 @@ func TestBlockedBySafeBrowsing(t *testing.T) {
 	forwardConf := ServerConfig{
 		UDPListenAddrs: []*net.UDPAddr{{}},
 		TCPListenAddrs: []*net.TCPAddr{{}},
+		TLSConf:        &TLSConfig{},
 		Config: Config{
 			UpstreamMode: UpstreamModeLoadBalance,
 			EDNSClientSubnet: &EDNSClientSubnet{
@@ -1235,6 +1254,7 @@ func TestRewrite(t *testing.T) {
 	assert.NoError(t, s.Prepare(&ServerConfig{
 		UDPListenAddrs: []*net.UDPAddr{{}},
 		TCPListenAddrs: []*net.TCPAddr{{}},
+		TLSConf:        &TLSConfig{},
 		Config: Config{
 			UpstreamDNS:  []string{"8.8.8.8:53"},
 			UpstreamMode: UpstreamModeLoadBalance,
@@ -1369,6 +1389,7 @@ func TestPTRResponseFromDHCPLeases(t *testing.T) {
 	s.conf.UDPListenAddrs = []*net.UDPAddr{{}}
 	s.conf.TCPListenAddrs = []*net.TCPAddr{{}}
 	s.conf.UpstreamDNS = []string{"127.0.0.1:53"}
+	s.conf.TLSConf = &TLSConfig{}
 	s.conf.Config.EDNSClientSubnet = &EDNSClientSubnet{Enabled: false}
 	s.conf.Config.ClientsContainer = EmptyClientsContainer{}
 	s.conf.Config.UpstreamMode = UpstreamModeLoadBalance
@@ -1457,6 +1478,7 @@ func TestPTRResponseFromHosts(t *testing.T) {
 	s.conf.UDPListenAddrs = []*net.UDPAddr{{}}
 	s.conf.TCPListenAddrs = []*net.TCPAddr{{}}
 	s.conf.UpstreamDNS = []string{"127.0.0.1:53"}
+	s.conf.TLSConf = &TLSConfig{}
 	s.conf.Config.EDNSClientSubnet = &EDNSClientSubnet{Enabled: false}
 	s.conf.Config.ClientsContainer = EmptyClientsContainer{}
 	s.conf.Config.UpstreamMode = UpstreamModeLoadBalance
@@ -1723,6 +1745,7 @@ func TestServer_Exchange(t *testing.T) {
 			srv := createTestServer(t, &filtering.Config{
 				BlockingMode: filtering.BlockingModeDefault,
 			}, ServerConfig{
+				TLSConf: &TLSConfig{},
 				Config: Config{
 					UpstreamDNS:      []string{upsAddr},
 					UpstreamMode:     UpstreamModeLoadBalance,
@@ -1746,6 +1769,7 @@ func TestServer_Exchange(t *testing.T) {
 		srv := createTestServer(t, &filtering.Config{
 			BlockingMode: filtering.BlockingModeDefault,
 		}, ServerConfig{
+			TLSConf: &TLSConfig{},
 			Config: Config{
 				UpstreamDNS:      []string{upsAddr},
 				UpstreamMode:     UpstreamModeLoadBalance,
--- a/internal/dnsforward/dnsrewrite_internal_test.go
+++ b/internal/dnsforward/dnsrewrite_internal_test.go
@@ -37,6 +37,7 @@ func TestServer_FilterDNSRewrite(t *testing.T) {
 	srv := createTestServer(t, &filtering.Config{
 		BlockingMode: filtering.BlockingModeDefault,
 	}, ServerConfig{
+		TLSConf: &TLSConfig{},
 		Config: Config{
 			UpstreamMode:     UpstreamModeLoadBalance,
 			EDNSClientSubnet: &EDNSClientSubnet{Enabled: false},
--- a/internal/dnsforward/filter_internal_test.go
+++ b/internal/dnsforward/filter_internal_test.go
@@ -31,6 +31,7 @@ func TestHandleDNSRequest_handleDNSRequest(t *testing.T) {
 	forwardConf := ServerConfig{
 		UDPListenAddrs: []*net.UDPAddr{{}},
 		TCPListenAddrs: []*net.TCPAddr{{}},
+		TLSConf:        &TLSConfig{},
 		Config: Config{
 			UpstreamMode: UpstreamModeLoadBalance,
 			EDNSClientSubnet: &EDNSClientSubnet{
--- a/internal/dnsforward/http_internal_test.go
+++ b/internal/dnsforward/http_internal_test.go
@@ -76,6 +76,7 @@ func TestDNSForwardHTTP_handleGetConfig(t *testing.T) {
 	forwardConf := ServerConfig{
 		UDPListenAddrs: []*net.UDPAddr{},
 		TCPListenAddrs: []*net.TCPAddr{},
+		TLSConf:        &TLSConfig{},
 		Config: Config{
 			UpstreamDNS:            []string{"8.8.8.8:53", "8.8.4.4:53"},
 			FallbackDNS:            []string{"9.9.9.10"},
@@ -159,6 +160,7 @@ func TestDNSForwardHTTP_handleSetConfig(t *testing.T) {
 	forwardConf := ServerConfig{
 		UDPListenAddrs: []*net.UDPAddr{},
 		TCPListenAddrs: []*net.TCPAddr{},
+		TLSConf:        &TLSConfig{},
 		Config: Config{
 			UpstreamDNS:            []string{"8.8.8.8:53", "8.8.4.4:53"},
 			RatelimitSubnetLenIPv4: 24,
@@ -369,6 +371,7 @@ func TestServer_HandleTestUpstreamDNS(t *testing.T) {
 		UDPListenAddrs:  []*net.UDPAddr{{}},
 		TCPListenAddrs:  []*net.TCPAddr{{}},
 		UpstreamTimeout: upsTimeout,
+		TLSConf:         &TLSConfig{},
 		Config: Config{
 			UpstreamMode:     UpstreamModeLoadBalance,
 			EDNSClientSubnet: &EDNSClientSubnet{Enabled: false},
--- a/internal/dnsforward/process.go
+++ b/internal/dnsforward/process.go
@@ -246,9 +246,9 @@ func (s *Server) makeDDRResponse(req *dns.Msg) (resp *dns.Msg) {

 	// TODO(e.burkov):  Think about storing the FQDN version of the server's
 	// name somewhere.
-	domainName := dns.Fqdn(s.conf.ServerName)
+	domainName := dns.Fqdn(s.conf.TLSConf.ServerName)

-	for _, addr := range s.conf.HTTPSListenAddrs {
+	for _, addr := range s.conf.TLSConf.HTTPSListenAddrs {
 		values := []dns.SVCBKeyValue{
 			&dns.SVCBAlpn{Alpn: []string{"h2"}},
 			&dns.SVCBPort{Port: uint16(addr.Port)},
@@ -265,7 +265,7 @@ func (s *Server) makeDDRResponse(req *dns.Msg) (resp *dns.Msg) {
 		resp.Answer = append(resp.Answer, ans)
 	}

-	if s.conf.hasIPAddrs {
+	if s.hasIPAddrs {
 		// Only add DNS-over-TLS resolvers in case the certificate contains IP
 		// addresses.
 		//
--- a/internal/dnsforward/process_internal_test.go
+++ b/internal/dnsforward/process_internal_test.go
@@ -3,6 +3,7 @@ package dnsforward
 import (
 	"cmp"
 	"context"
+	"crypto/tls"
 	"net"
 	"net/netip"
 	"testing"
@@ -77,6 +78,7 @@ func TestServer_ProcessInitial(t *testing.T) {
 			t.Parallel()

 			c := ServerConfig{
+				TLSConf: &TLSConfig{},
 				Config: Config{
 					AAAADisabled:     tc.aaaaDisabled,
 					UpstreamMode:     UpstreamModeLoadBalance,
@@ -177,6 +179,7 @@ func TestServer_ProcessFilteringAfterResponse(t *testing.T) {
 			t.Parallel()

 			c := ServerConfig{
+				TLSConf: &TLSConfig{},
 				Config: Config{
 					AAAADisabled:     tc.aaaaDisabled,
 					UpstreamMode:     UpstreamModeLoadBalance,
@@ -316,6 +319,8 @@ func TestServer_ProcessDDRQuery(t *testing.T) {
 	}}

 	_, certPem, keyPem := createServerTLSConfig(t)
+	cert, err := tls.X509KeyPair(certPem, keyPem)
+	require.NoError(t, err)

 	for _, tc := range testCases {
 		t.Run(tc.name, func(t *testing.T) {
@@ -328,19 +333,18 @@ func TestServer_ProcessDDRQuery(t *testing.T) {
 					EDNSClientSubnet: &EDNSClientSubnet{Enabled: false},
 					ClientsContainer: EmptyClientsContainer{},
 				},
-				TLSConfig: TLSConfig{
-					ServerName:           ddrTestDomainName,
-					CertificateChainData: certPem,
-					PrivateKeyData:       keyPem,
-					TLSListenAddrs:       tc.addrsDoT,
-					HTTPSListenAddrs:     tc.addrsDoH,
-					QUICListenAddrs:      tc.addrsDoQ,
+				TLSConf: &TLSConfig{
+					ServerName:       ddrTestDomainName,
+					Cert:             &cert,
+					TLSListenAddrs:   tc.addrsDoT,
+					HTTPSListenAddrs: tc.addrsDoH,
+					QUICListenAddrs:  tc.addrsDoQ,
 				},
 				ServePlainDNS: true,
 			})
 			// TODO(e.burkov):  Generate a certificate actually containing the
 			// IP addresses.
-			s.conf.hasIPAddrs = true
+			s.hasIPAddrs = true

 			req := createTestMessageWithType(tc.host, tc.qtype)

@@ -657,6 +661,7 @@ func TestServer_HandleDNSRequest_restrictLocal(t *testing.T) {
 	}, ServerConfig{
 		UDPListenAddrs: []*net.UDPAddr{{}},
 		TCPListenAddrs: []*net.TCPAddr{{}},
+		TLSConf:        &TLSConfig{},
 		// TODO(s.chzhen):  Add tests where EDNSClientSubnet.Enabled is true.
 		// Improve Config declaration for tests.
 		Config: Config{
@@ -789,6 +794,7 @@ func TestServer_ProcessUpstream_localPTR(t *testing.T) {
 			ServerConfig{
 				UDPListenAddrs: []*net.UDPAddr{{}},
 				TCPListenAddrs: []*net.TCPAddr{{}},
+				TLSConf:        &TLSConfig{},
 				Config: Config{
 					UpstreamMode:     UpstreamModeLoadBalance,
 					EDNSClientSubnet: &EDNSClientSubnet{Enabled: false},
@@ -818,6 +824,7 @@ func TestServer_ProcessUpstream_localPTR(t *testing.T) {
 			ServerConfig{
 				UDPListenAddrs: []*net.UDPAddr{{}},
 				TCPListenAddrs: []*net.TCPAddr{{}},
+				TLSConf:        &TLSConfig{},
 				Config: Config{
 					UpstreamMode:     UpstreamModeLoadBalance,
 					EDNSClientSubnet: &EDNSClientSubnet{Enabled: false},
--- a/internal/dnsforward/svcbmsg_internal_test.go
+++ b/internal/dnsforward/svcbmsg_internal_test.go
@@ -16,6 +16,7 @@ func TestGenAnswerHTTPS_andSVCB(t *testing.T) {
 	s := createTestServer(t, &filtering.Config{
 		BlockingMode: filtering.BlockingModeDefault,
 	}, ServerConfig{
+		TLSConf: &TLSConfig{},
 		Config: Config{
 			UpstreamMode:     UpstreamModeLoadBalance,
 			EDNSClientSubnet: &EDNSClientSubnet{Enabled: false},
--- a/internal/home/config.go
+++ b/internal/home/config.go
@@ -6,6 +6,7 @@ import (
 	"net/netip"
 	"os"
 	"path/filepath"
+	"slices"
 	"sync"

 	"github.com/AdguardTeam/AdGuardHome/internal/aghalg"
@@ -23,6 +24,7 @@ import (
 	"github.com/AdguardTeam/golibs/log"
 	"github.com/AdguardTeam/golibs/netutil"
 	"github.com/AdguardTeam/golibs/timeutil"
+	"github.com/google/go-cmp/cmp"
 	"github.com/google/renameio/v2/maybe"
 	yaml "gopkg.in/yaml.v3"
 )
@@ -263,28 +265,116 @@ type dnsConfig struct {
 	HostsFileEnabled bool `yaml:"hostsfile_enabled"`
 }

+// tlsConfigSettings is the TLS configuration for DNS-over-TLS, DNS-over-QUIC,
+// and HTTPS.  When adding new properties, update the [tlsConfigSettings.clone]
+// and [tlsConfigSettings.setPrivateFieldsAndCompare] methods as necessary.
 type tlsConfigSettings struct {
-	Enabled         bool   `yaml:"enabled" json:"enabled"`                                 // Enabled is the encryption (DoT/DoH/HTTPS) status
-	ServerName      string `yaml:"server_name" json:"server_name,omitempty"`               // ServerName is the hostname of your HTTPS/TLS server
-	ForceHTTPS      bool   `yaml:"force_https" json:"force_https"`                         // ForceHTTPS: if true, forces HTTP->HTTPS redirect
-	PortHTTPS       uint16 `yaml:"port_https" json:"port_https,omitempty"`                 // HTTPS port. If 0, HTTPS will be disabled
-	PortDNSOverTLS  uint16 `yaml:"port_dns_over_tls" json:"port_dns_over_tls,omitempty"`   // DNS-over-TLS port. If 0, DoT will be disabled
-	PortDNSOverQUIC uint16 `yaml:"port_dns_over_quic" json:"port_dns_over_quic,omitempty"` // DNS-over-QUIC port. If 0, DoQ will be disabled
+	// Enabled indicates whether encryption (DoT/DoH/HTTPS) is enabled.
+	Enabled bool `yaml:"enabled" json:"enabled"`

-	// PortDNSCrypt is the port for DNSCrypt requests.  If it's zero,
-	// DNSCrypt is disabled.
+	// ServerName is the hostname of the HTTPS/TLS server.
+	ServerName string `yaml:"server_name" json:"server_name,omitempty"`
+
+	// ForceHTTPS, if true, forces an HTTP to HTTPS redirect.
+	ForceHTTPS bool `yaml:"force_https" json:"force_https"`
+
+	// PortHTTPS is the HTTPS port.  If 0, HTTPS will be disabled.
+	PortHTTPS uint16 `yaml:"port_https" json:"port_https,omitempty"`
+
+	// PortDNSOverTLS is the DNS-over-TLS port.  If 0, DoT will be disabled.
+	PortDNSOverTLS uint16 `yaml:"port_dns_over_tls" json:"port_dns_over_tls,omitempty"`
+
+	// PortDNSOverQUIC is the DNS-over-QUIC port.  If 0, DoQ will be disabled.
+	PortDNSOverQUIC uint16 `yaml:"port_dns_over_quic" json:"port_dns_over_quic,omitempty"`
+
+	// PortDNSCrypt is the port for DNSCrypt requests.  If it's zero, DNSCrypt
+	// is disabled.
 	PortDNSCrypt uint16 `yaml:"port_dnscrypt" json:"port_dnscrypt"`
-	// DNSCryptConfigFile is the path to the DNSCrypt config file.  Must be
-	// set if PortDNSCrypt is not zero.
+
+	// DNSCryptConfigFile is the path to the DNSCrypt config file.  Must be set
+	// if PortDNSCrypt is not zero.
 	//
 	// See https://github.com/AdguardTeam/dnsproxy and
 	// https://github.com/ameshkov/dnscrypt.
 	DNSCryptConfigFile string `yaml:"dnscrypt_config_file" json:"dnscrypt_config_file"`

-	// Allow DoH queries via unencrypted HTTP (e.g. for reverse proxying)
+	// AllowUnencryptedDoH allows DoH queries via unencrypted HTTP (e.g. for
+	// reverse proxying).
+	//
+	// TODO(s.chzhen):  Add this option into the Web UI.
 	AllowUnencryptedDoH bool `yaml:"allow_unencrypted_doh" json:"allow_unencrypted_doh"`

-	dnsforward.TLSConfig `yaml:",inline" json:",inline"`
+	// CertificateChain is the PEM-encoded certificate chain.  Must be empty if
+	// [tlsConfigSettings.CertificatePath] is provided.
+	CertificateChain string `yaml:"certificate_chain" json:"certificate_chain"`
+
+	// PrivateKey is the PEM-encoded private key.  Must be empty if
+	// [tlsConfigSettings.PrivateKeyPath] is provided.
+	PrivateKey string `yaml:"private_key" json:"private_key"`
+
+	// CertificatePath is the path to the certificate file.  Must be empty if
+	// [tlsConfigSettings.CertificateChain] is provided.
+	CertificatePath string `yaml:"certificate_path" json:"certificate_path"`
+
+	// PrivateKeyPath is the path to the private key file.  Must be empty if
+	// [tlsConfigSettings.PrivateKey] is provided.
+	PrivateKeyPath string `yaml:"private_key_path" json:"private_key_path"`
+
+	// OverrideTLSCiphers, when set, contains the names of the cipher suites to
+	// use.  If the slice is empty, the default safe suites are used.
+	OverrideTLSCiphers []string `yaml:"override_tls_ciphers,omitempty" json:"-"`
+
+	// CertificateChainData is the PEM-encoded byte data for the certificate
+	// chain.
+	CertificateChainData []byte `yaml:"-" json:"-"`
+
+	// PrivateKeyData is the PEM-encoded byte data for the private key.
+	PrivateKeyData []byte `yaml:"-" json:"-"`
+
+	// StrictSNICheck controls if the connections with SNI mismatching the
+	// certificate's ones should be rejected.
+	StrictSNICheck bool `yaml:"strict_sni_check" json:"-"`
+}
+
+// clone returns a deep copy of c.
+func (c *tlsConfigSettings) clone() (clone *tlsConfigSettings) {
+	clone = &tlsConfigSettings{}
+	*clone = *c
+
+	clone.OverrideTLSCiphers = slices.Clone(c.OverrideTLSCiphers)
+	clone.CertificateChainData = slices.Clone(c.CertificateChainData)
+	clone.PrivateKeyData = slices.Clone(c.PrivateKeyData)
+
+	return clone
+}
+
+// setPrivateFieldsAndCompare sets any missing properties in conf to match those
+// in c and returns true if TLS configurations are equal.  conf must not be be
+// nil.
+// It sets the following properties because these are not accepted from the
+// frontend:
+//
+//	[tlsConfigSettings.AllowUnencryptedDoH]
+//	[tlsConfigSettings.DNSCryptConfigFile]
+//	[tlsConfigSettings.OverrideTLSCiphers]
+//	[tlsConfigSettings.PortDNSCrypt]
+//
+// The following properties are skipped as they are set by
+// [tlsManager.loadTLSConfig]:
+//
+//	[tlsConfigSettings.CertificateChainData]
+//	[tlsConfigSettings.PrivateKeyData]
+func (c *tlsConfigSettings) setPrivateFieldsAndCompare(conf *tlsConfigSettings) (equal bool) {
+	conf.OverrideTLSCiphers = slices.Clone(c.OverrideTLSCiphers)
+
+	// TODO(s.chzhen):  Remove this once the frontend supports it.
+	conf.AllowUnencryptedDoH = c.AllowUnencryptedDoH
+
+	conf.DNSCryptConfigFile = c.DNSCryptConfigFile
+	conf.PortDNSCrypt = c.PortDNSCrypt
+
+	// TODO(a.garipov): Define a custom comparer.
+	return cmp.Equal(c, conf)
 }

 type queryLogConfig struct {
@@ -649,9 +739,8 @@ func (c *configuration) write(tlsMgr *tlsManager) (err error) {
 	}

 	if tlsMgr != nil {
-		tlsConf := tlsConfigSettings{}
-		tlsMgr.WriteDiskConfig(&tlsConf)
-		config.TLS = tlsConf
+		tlsConf := tlsMgr.config()
+		config.TLS = *tlsConf
 	}

 	if globalContext.stats != nil {
--- a/internal/home/controlupdate.go
+++ b/internal/home/controlupdate.go
@@ -164,11 +164,8 @@ func (vr *versionResponse) setAllowedToAutoUpdate(tlsMgr *tlsManager) (err error
 		return nil
 	}

-	tlsConf := &tlsConfigSettings{}
-	tlsMgr.WriteDiskConfig(tlsConf)
-
 	canUpdate := true
-	if tlsConfUsesPrivilegedPorts(tlsConf) ||
+	if tlsConfUsesPrivilegedPorts(tlsMgr.config()) ||
 		config.HTTPConfig.Address.Port() < 1024 ||
 		config.DNS.Port < 1024 {
 		canUpdate, err = aghnet.CanBindPrivilegedPorts()
--- a/internal/home/dns.go
+++ b/internal/home/dns.go
@@ -2,6 +2,7 @@ package home

 import (
 	"context"
+	"crypto/tls"
 	"fmt"
 	"log/slog"
 	"net"
@@ -111,9 +112,6 @@ func initDNS(
 		return err
 	}

-	tlsConf := &tlsConfigSettings{}
-	tlsMgr.WriteDiskConfig(tlsConf)
-
 	return initDNSServer(
 		globalContext.filters,
 		globalContext.stats,
@@ -121,7 +119,7 @@ func initDNS(
 		globalContext.dhcpServer,
 		anonymizer,
 		httpRegister,
-		tlsConf,
+		tlsMgr.config(),
 		tlsMgr,
 		baseLogger,
 	)
@@ -255,11 +253,16 @@ func newServerConfig(
 	fwdConf := dnsConf.Config
 	fwdConf.ClientsContainer = clientsContainer

+	intTLSConf, err := newDNSTLSConfig(tlsConf, hosts)
+	if err != nil {
+		return nil, fmt.Errorf("constructing tls config: %w", err)
+	}
+
 	newConf = &dnsforward.ServerConfig{
 		UDPListenAddrs:         ipsToUDPAddrs(hosts, dnsConf.Port),
 		TCPListenAddrs:         ipsToTCPAddrs(hosts, dnsConf.Port),
 		Config:                 fwdConf,
-		TLSConfig:              newDNSTLSConfig(tlsConf, hosts),
+		TLSConf:                intTLSConf,
 		TLSAllowUnencryptedDoH: tlsConf.AllowUnencryptedDoH,
 		UpstreamTimeout:        time.Duration(dnsConf.UpstreamTimeout),
 		TLSv12Roots:            tlsMgr.rootCerts,
@@ -304,14 +307,25 @@ func newServerConfig(
 }

 // newDNSTLSConfig converts values from the configuration file into the internal
-// TLS settings for the DNS server.  tlsConf must not be nil.
-func newDNSTLSConfig(conf *tlsConfigSettings, addrs []netip.Addr) (dnsConf dnsforward.TLSConfig) {
+// TLS settings for the DNS server.  conf must not be nil.
+func newDNSTLSConfig(
+	conf *tlsConfigSettings,
+	addrs []netip.Addr,
+) (dnsConf *dnsforward.TLSConfig, err error) {
 	if !conf.Enabled {
-		return dnsforward.TLSConfig{}
+		return &dnsforward.TLSConfig{}, nil
 	}

-	dnsConf = conf.TLSConfig
-	dnsConf.ServerName = conf.ServerName
+	cert, err := tls.X509KeyPair(conf.CertificateChainData, conf.PrivateKeyData)
+	if err != nil {
+		return nil, fmt.Errorf("parsing tls key pair: %w", err)
+	}
+
+	dnsConf = &dnsforward.TLSConfig{
+		Cert:           &cert,
+		ServerName:     conf.ServerName,
+		StrictSNICheck: conf.StrictSNICheck,
+	}

 	if conf.PortHTTPS != 0 {
 		dnsConf.HTTPSListenAddrs = ipsToTCPAddrs(addrs, conf.PortHTTPS)
@@ -325,7 +339,7 @@ func newDNSTLSConfig(conf *tlsConfigSettings, addrs []netip.Addr) (dnsConf dnsfo
 		dnsConf.QUICListenAddrs = ipsToUDPAddrs(addrs, conf.PortDNSOverQUIC)
 	}

-	return dnsConf
+	return dnsConf, nil
 }

 // newDNSCryptConfig converts values from the configuration file into the
@@ -378,8 +392,7 @@ type dnsEncryption struct {
 // getDNSEncryption returns the TLS encryption addresses that AdGuard Home
 // listens on.  tlsMgr must not be nil.
 func getDNSEncryption(tlsMgr *tlsManager) (de dnsEncryption) {
-	tlsConf := tlsConfigSettings{}
-	tlsMgr.WriteDiskConfig(&tlsConf)
+	tlsConf := tlsMgr.config()

 	if !tlsConf.Enabled || len(tlsConf.ServerName) == 0 {
 		return dnsEncryption{}
--- a/internal/home/home.go
+++ b/internal/home/home.go
@@ -991,9 +991,9 @@ func printWebAddrs(proto, addr string, port uint16) {
 //
 // TODO(s.chzhen):  Implement separate functions for HTTP and HTTPS.
 func printHTTPAddresses(proto string, tlsMgr *tlsManager) {
-	tlsConf := tlsConfigSettings{}
+	var tlsConf *tlsConfigSettings
 	if tlsMgr != nil {
-		tlsMgr.WriteDiskConfig(&tlsConf)
+		tlsConf = tlsMgr.config()
 	}

 	port := config.HTTPConfig.Address.Port()
--- a/internal/home/tls.go
+++ b/internal/home/tls.go
@@ -24,11 +24,9 @@ import (
 	"github.com/AdguardTeam/AdGuardHome/internal/aghhttp"
 	"github.com/AdguardTeam/AdGuardHome/internal/aghnet"
 	"github.com/AdguardTeam/AdGuardHome/internal/aghtls"
-	"github.com/AdguardTeam/AdGuardHome/internal/dnsforward"
 	"github.com/AdguardTeam/golibs/errors"
 	"github.com/AdguardTeam/golibs/logutil/slogutil"
 	"github.com/c2h5oh/datasize"
-	"github.com/google/go-cmp/cmp"
 )

 // tlsManager contains the current configuration and state of AdGuard Home TLS
@@ -37,6 +35,9 @@ type tlsManager struct {
 	// logger is used for logging the operation of the TLS Manager.
 	logger *slog.Logger

+	// mu protects status, certLastMod, conf, and servePlainDNS.
+	mu *sync.Mutex
+
 	// status is the current status of the configuration.  It is never nil.
 	status *tlsConfigStatus

@@ -52,6 +53,9 @@ type tlsManager struct {
 	// Resolve it.
 	web *webAPI

+	// conf contains the TLS configuration settings.  It must not be nil.
+	conf *tlsConfigSettings
+
 	// configModified is called when the TLS configuration is changed via an
 	// HTTP request.
 	configModified func()
@@ -59,9 +63,6 @@ type tlsManager struct {
 	// customCipherIDs are the ID of the cipher suites that AdGuard Home must use.
 	customCipherIDs []uint16

-	confLock sync.Mutex
-	conf     tlsConfigSettings
-
 	// servePlainDNS defines if plain DNS is allowed for incoming requests.
 	servePlainDNS bool
 }
@@ -91,9 +92,10 @@ type tlsManagerConfig struct {
 func newTLSManager(ctx context.Context, conf *tlsManagerConfig) (m *tlsManager, err error) {
 	m = &tlsManager{
 		logger:         conf.logger,
+		mu:             &sync.Mutex{},
 		configModified: conf.configModified,
 		status:         &tlsConfigStatus{},
-		conf:           conf.tlsSettings,
+		conf:           &conf.tlsSettings,
 		servePlainDNS:  conf.servePlainDNS,
 	}

@@ -112,17 +114,22 @@ func newTLSManager(ctx context.Context, conf *tlsManagerConfig) (m *tlsManager,
 		m.logger.InfoContext(ctx, "using default ciphers")
 	}

-	if m.conf.Enabled {
-		err = m.load(ctx)
-		if err != nil {
-			m.conf.Enabled = false
+	m.mu.Lock()
+	defer m.mu.Unlock()

-			return m, err
-		}
-
-		m.setCertFileTime(ctx)
+	if !m.conf.Enabled {
+		return m, nil
 	}

+	err = m.load(ctx)
+	if err != nil {
+		m.conf.Enabled = false
+
+		return m, err
+	}
+
+	m.setCertFileTime(ctx)
+
 	return m, nil
 }

@@ -136,8 +143,9 @@ func (m *tlsManager) setWebAPI(webAPI *webAPI) {
 }

 // load reloads the TLS configuration from files or data from the config file.
+// m.mu is expected to be locked.
 func (m *tlsManager) load(ctx context.Context) (err error) {
-	err = m.loadTLSConf(ctx, &m.conf, m.status)
+	err = m.loadTLSConfig(ctx, m.conf, m.status)
 	if err != nil {
 		return fmt.Errorf("loading config: %w", err)
 	}
@@ -145,15 +153,16 @@ func (m *tlsManager) load(ctx context.Context) (err error) {
 	return nil
 }

-// WriteDiskConfig - write config
-func (m *tlsManager) WriteDiskConfig(conf *tlsConfigSettings) {
-	m.confLock.Lock()
-	*conf = m.conf
-	m.confLock.Unlock()
+// config returns a deep copy of the stored TLS configuration.
+func (m *tlsManager) config() (conf *tlsConfigSettings) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+
+	return m.conf.clone()
 }

 // setCertFileTime sets [tlsManager.certLastMod] from the certificate.  If there
-// are errors, setCertFileTime logs them.
+// are errors, setCertFileTime logs them.  m.mu is expected to be locked.
 func (m *tlsManager) setCertFileTime(ctx context.Context) {
 	if len(m.conf.CertificatePath) == 0 {
 		return
@@ -175,21 +184,21 @@ func (m *tlsManager) setCertFileTime(ctx context.Context) {
 func (m *tlsManager) start(_ context.Context) {
 	m.registerWebHandlers()

-	m.confLock.Lock()
-	tlsConf := m.conf
-	m.confLock.Unlock()
+	m.mu.Lock()
+	defer m.mu.Unlock()

 	// The background context is used because the TLSConfigChanged wraps context
 	// with timeout on its own and shuts down the server, which handles current
 	// request.
-	m.web.tlsConfigChanged(context.Background(), tlsConf)
+	m.web.tlsConfigChanged(context.Background(), m.conf)
 }

 // reload updates the configuration and restarts the TLS manager.
 func (m *tlsManager) reload(ctx context.Context) {
-	m.confLock.Lock()
+	m.mu.Lock()
+	defer m.mu.Unlock()
+
 	tlsConf := m.conf
-	m.confLock.Unlock()

 	if !tlsConf.Enabled || len(tlsConf.CertificatePath) == 0 {
 		return
@@ -211,9 +220,7 @@ func (m *tlsManager) reload(ctx context.Context) {

 	m.logger.InfoContext(ctx, "certificate file is modified")

-	m.confLock.Lock()
 	err = m.load(ctx)
-	m.confLock.Unlock()
 	if err != nil {
 		m.logger.ErrorContext(ctx, "reloading", slogutil.KeyError, err)

@@ -227,10 +234,6 @@ func (m *tlsManager) reload(ctx context.Context) {
 		m.logger.ErrorContext(ctx, "reconfiguring dns server", slogutil.KeyError, err)
 	}

-	m.confLock.Lock()
-	tlsConf = m.conf
-	m.confLock.Unlock()
-
 	// The background context is used because the TLSConfigChanged wraps context
 	// with timeout on its own and shuts down the server, which handles current
 	// request.
@@ -238,15 +241,12 @@ func (m *tlsManager) reload(ctx context.Context) {
 }

 // reconfigureDNSServer updates the DNS server configuration using the stored
-// TLS settings.
+// TLS settings.  m.mu is expected to be locked.
 func (m *tlsManager) reconfigureDNSServer() (err error) {
-	tlsConf := &tlsConfigSettings{}
-	m.WriteDiskConfig(tlsConf)
-
 	newConf, err := newServerConfig(
 		&config.DNS,
 		config.Clients.Sources,
-		tlsConf,
+		m.conf,
 		m,
 		httpRegister,
 		globalContext.clients.storage,
@@ -263,9 +263,11 @@ func (m *tlsManager) reconfigureDNSServer() (err error) {
 	return nil
 }

-// loadTLSConf loads and validates the TLS configuration.  The returned error is
-// also set in status.WarningValidation.
-func (m *tlsManager) loadTLSConf(
+// loadTLSConfig loads and validates the TLS configuration.  It also sets
+// [tlsConfigSettings.CertificateChainData] and
+// [tlsConfigSettings.PrivateKeyData] properties.  The returned error is also
+// set in status.WarningValidation.
+func (m *tlsManager) loadTLSConfig(
 	ctx context.Context,
 	tlsConf *tlsConfigSettings,
 	status *tlsConfigStatus,
@@ -357,10 +359,10 @@ type tlsConfigStatus struct {
 	KeyType string `json:"key_type,omitempty"`

 	// NotBefore is the NotBefore field of the first certificate in the chain.
-	NotBefore time.Time `json:"not_before,omitempty"`
+	NotBefore time.Time `json:"not_before"`

 	// NotAfter is the NotAfter field of the first certificate in the chain.
-	NotAfter time.Time `json:"not_after,omitempty"`
+	NotAfter time.Time `json:"not_after"`

 	// WarningValidation is a validation warning message with the issue
 	// description.
@@ -410,15 +412,23 @@ type tlsConfigSettingsExt struct {

 // handleTLSStatus is the handler for the GET /control/tls/status HTTP API.
 func (m *tlsManager) handleTLSStatus(w http.ResponseWriter, r *http.Request) {
-	m.confLock.Lock()
+	var tlsConf *tlsConfigSettings
+	var servePlainDNS bool
+	func() {
+		m.mu.Lock()
+		defer m.mu.Unlock()
+
+		tlsConf = m.conf.clone()
+		servePlainDNS = m.servePlainDNS
+	}()
+
 	data := tlsConfig{
 		tlsConfigSettingsExt: tlsConfigSettingsExt{
-			tlsConfigSettings: m.conf,
-			ServePlainDNS:     aghalg.BoolToNullBool(m.servePlainDNS),
+			tlsConfigSettings: *tlsConf,
+			ServePlainDNS:     aghalg.BoolToNullBool(servePlainDNS),
 		},
 		tlsConfigStatus: m.status,
 	}
-	m.confLock.Unlock()

 	marshalTLS(w, r, data)
 }
@@ -434,6 +444,9 @@ func (m *tlsManager) handleTLSValidate(w http.ResponseWriter, r *http.Request) {
 		return
 	}

+	m.mu.Lock()
+	defer m.mu.Unlock()
+
 	if setts.PrivateKeySaved {
 		setts.PrivateKey = m.conf.PrivateKey
 	}
@@ -449,7 +462,7 @@ func (m *tlsManager) handleTLSValidate(w http.ResponseWriter, r *http.Request) {
 	// Skip the error check, since we are only interested in the value of
 	// status.WarningValidation.
 	status := &tlsConfigStatus{}
-	_ = m.loadTLSConf(ctx, &setts.tlsConfigSettings, status)
+	_ = m.loadTLSConfig(ctx, &setts.tlsConfigSettings, status)
 	resp := tlsConfig{
 		tlsConfigSettingsExt: setts,
 		tlsConfigStatus:      status,
@@ -458,42 +471,23 @@ func (m *tlsManager) handleTLSValidate(w http.ResponseWriter, r *http.Request) {
 	marshalTLS(w, r, resp)
 }

-// setConfig updates manager conf with the given one.
+// setConfig updates manager TLS configuration with the given one.  m.mu is
+// expected to be locked.
 func (m *tlsManager) setConfig(
 	ctx context.Context,
 	newConf tlsConfigSettings,
 	status *tlsConfigStatus,
 	servePlain aghalg.NullBool,
 ) (restartHTTPS bool) {
-	m.confLock.Lock()
-	defer m.confLock.Unlock()
-
-	// Reset the DNSCrypt data before comparing, since we currently do not
-	// accept these from the frontend.
-	//
-	// TODO(a.garipov): Define a custom comparer for dnsforward.TLSConfig.
-	newConf.DNSCryptConfigFile = m.conf.DNSCryptConfigFile
-	newConf.PortDNSCrypt = m.conf.PortDNSCrypt
-	if !cmp.Equal(m.conf, newConf, cmp.AllowUnexported(dnsforward.TLSConfig{})) {
+	if !m.conf.setPrivateFieldsAndCompare(&newConf) {
 		m.logger.InfoContext(ctx, "config has changed, restarting https server")
 		restartHTTPS = true
 	} else {
 		m.logger.InfoContext(ctx, "config has not changed")
 	}

-	// Note: don't do just `t.conf = data` because we must preserve all other members of t.conf
-	m.conf.Enabled = newConf.Enabled
-	m.conf.ServerName = newConf.ServerName
-	m.conf.ForceHTTPS = newConf.ForceHTTPS
-	m.conf.PortHTTPS = newConf.PortHTTPS
-	m.conf.PortDNSOverTLS = newConf.PortDNSOverTLS
-	m.conf.PortDNSOverQUIC = newConf.PortDNSOverQUIC
-	m.conf.CertificateChain = newConf.CertificateChain
-	m.conf.CertificatePath = newConf.CertificatePath
-	m.conf.CertificateChainData = newConf.CertificateChainData
-	m.conf.PrivateKey = newConf.PrivateKey
-	m.conf.PrivateKeyPath = newConf.PrivateKeyPath
-	m.conf.PrivateKeyData = newConf.PrivateKeyData
+	m.conf = &newConf
+
 	m.status = status

 	if servePlain != aghalg.NBNull {
@@ -515,6 +509,16 @@ func (m *tlsManager) handleTLSConfigure(w http.ResponseWriter, r *http.Request)
 		return
 	}

+	var restartHTTPS bool
+	defer func() {
+		if restartHTTPS {
+			m.configModified()
+		}
+	}()
+
+	m.mu.Lock()
+	defer m.mu.Unlock()
+
 	if req.PrivateKeySaved {
 		req.PrivateKey = m.conf.PrivateKey
 	}
@@ -526,7 +530,7 @@ func (m *tlsManager) handleTLSConfigure(w http.ResponseWriter, r *http.Request)
 	}

 	status := &tlsConfigStatus{}
-	err = m.loadTLSConf(ctx, &req.tlsConfigSettings, status)
+	err = m.loadTLSConfig(ctx, &req.tlsConfigSettings, status)
 	if err != nil {
 		resp := tlsConfig{
 			tlsConfigSettingsExt: req,
@@ -538,20 +542,18 @@ func (m *tlsManager) handleTLSConfigure(w http.ResponseWriter, r *http.Request)
 		return
 	}

-	restartHTTPS := m.setConfig(ctx, req.tlsConfigSettings, status, req.ServePlainDNS)
+	restartHTTPS = m.setConfig(ctx, req.tlsConfigSettings, status, req.ServePlainDNS)
 	m.setCertFileTime(ctx)

 	if req.ServePlainDNS != aghalg.NBNull {
 		func() {
-			m.confLock.Lock()
-			defer m.confLock.Unlock()
+			config.Lock()
+			defer config.Unlock()

 			config.DNS.ServePlainDNS = req.ServePlainDNS == aghalg.NBTrue
 		}()
 	}

-	m.configModified()
-
 	err = m.reconfigureDNSServer()
 	if err != nil {
 		m.logger.ErrorContext(ctx, "reconfiguring dns server", slogutil.KeyError, err)
@@ -567,18 +569,18 @@ func (m *tlsManager) handleTLSConfigure(w http.ResponseWriter, r *http.Request)
 	}

 	marshalTLS(w, r, resp)
-	if f, ok := w.(http.Flusher); ok {
-		f.Flush()
+	rc := http.NewResponseController(w)
+	err = rc.Flush()
+	if err != nil {
+		m.logger.ErrorContext(ctx, "flushing response", slogutil.KeyError, err)
 	}

 	// The background context is used because the TLSConfigChanged wraps context
 	// with timeout on its own and shuts down the server, which handles current
-	// request. It is also should be done in a separate goroutine due to the
+	// request.  It is also should be done in a separate goroutine due to the
 	// same reason.
 	if restartHTTPS {
-		go func() {
-			m.web.tlsConfigChanged(context.Background(), req.tlsConfigSettings)
-		}()
+		go m.web.tlsConfigChanged(context.Background(), &req.tlsConfigSettings)
 	}
 }

--- a/internal/home/tls_internal_test.go
+++ b/internal/home/tls_internal_test.go
@@ -239,11 +239,9 @@ func TestTLSManager_Reload(t *testing.T) {
 		logger:         logger,
 		configModified: func() {},
 		tlsSettings: tlsConfigSettings{
-			Enabled: true,
-			TLSConfig: dnsforward.TLSConfig{
-				CertificatePath: certPath,
-				PrivateKeyPath:  keyPath,
-			},
+			Enabled:         true,
+			CertificatePath: certPath,
+			PrivateKeyPath:  keyPath,
 		},
 		servePlainDNS: false,
 	})
@@ -254,8 +252,7 @@ func TestTLSManager_Reload(t *testing.T) {

 	m.setWebAPI(web)

-	conf := &tlsConfigSettings{}
-	m.WriteDiskConfig(conf)
+	conf := m.config()
 	assertCertSerialNumber(t, conf, snBefore)

 	certDER, key = newCertAndKey(t, snAfter)
@@ -263,7 +260,7 @@ func TestTLSManager_Reload(t *testing.T) {

 	m.reload(ctx)

-	m.WriteDiskConfig(conf)
+	conf = m.config()
 	assertCertSerialNumber(t, conf, snAfter)
 }

@@ -278,11 +275,9 @@ func TestTLSManager_HandleTLSStatus(t *testing.T) {
 		logger:         logger,
 		configModified: func() {},
 		tlsSettings: tlsConfigSettings{
-			Enabled: true,
-			TLSConfig: dnsforward.TLSConfig{
-				CertificateChain: string(testCertChainData),
-				PrivateKey:       string(testPrivateKeyData),
-			},
+			Enabled:          true,
+			CertificateChain: string(testCertChainData),
+			PrivateKey:       string(testPrivateKeyData),
 		},
 		servePlainDNS: false,
 	})
@@ -342,47 +337,49 @@ func TestValidateTLSSettings(t *testing.T) {
 	busyUDPPort := udpAddr.Port

 	testCases := []struct {
-		setts   tlsConfigSettingsExt
 		name    string
 		wantErr string
+		setts   tlsConfigSettingsExt
 	}{{
 		name:    "basic",
-		setts:   tlsConfigSettingsExt{},
 		wantErr: "",
+		setts:   tlsConfigSettingsExt{},
 	}, {
+		name:    "disabled_all",
+		wantErr: "plain DNS is required in case encryption protocols are disabled",
 		setts: tlsConfigSettingsExt{
 			ServePlainDNS: aghalg.NBFalse,
 		},
-		name:    "disabled_all",
-		wantErr: "plain DNS is required in case encryption protocols are disabled",
 	}, {
+		name:    "busy_https_port",
+		wantErr: fmt.Sprintf("port %d for HTTPS is not available", busyTCPPort),
 		setts: tlsConfigSettingsExt{
 			tlsConfigSettings: tlsConfigSettings{
 				Enabled:   true,
 				PortHTTPS: uint16(busyTCPPort),
 			},
 		},
-		name:    "busy_https_port",
-		wantErr: fmt.Sprintf("port %d for HTTPS is not available", busyTCPPort),
 	}, {
+		name:    "busy_dot_port",
+		wantErr: fmt.Sprintf("port %d for DNS-over-TLS is not available", busyTCPPort),
 		setts: tlsConfigSettingsExt{
 			tlsConfigSettings: tlsConfigSettings{
 				Enabled:        true,
 				PortDNSOverTLS: uint16(busyTCPPort),
 			},
 		},
-		name:    "busy_dot_port",
-		wantErr: fmt.Sprintf("port %d for DNS-over-TLS is not available", busyTCPPort),
 	}, {
+		name:    "busy_doq_port",
+		wantErr: fmt.Sprintf("port %d for DNS-over-QUIC is not available", busyUDPPort),
 		setts: tlsConfigSettingsExt{
 			tlsConfigSettings: tlsConfigSettings{
 				Enabled:         true,
 				PortDNSOverQUIC: uint16(busyUDPPort),
 			},
 		},
-		name:    "busy_doq_port",
-		wantErr: fmt.Sprintf("port %d for DNS-over-QUIC is not available", busyUDPPort),
 	}, {
+		name:    "duplicate_port",
+		wantErr: "validating tcp ports: duplicated values: [4433]",
 		setts: tlsConfigSettingsExt{
 			tlsConfigSettings: tlsConfigSettings{
 				Enabled:        true,
@@ -390,8 +387,6 @@ func TestValidateTLSSettings(t *testing.T) {
 				PortDNSOverTLS: 4433,
 			},
 		},
-		name:    "duplicate_port",
-		wantErr: "validating tcp ports: duplicated values: [4433]",
 	}}

 	for _, tc := range testCases {
@@ -417,11 +412,9 @@ func TestTLSManager_HandleTLSValidate(t *testing.T) {
 		logger:         logger,
 		configModified: func() {},
 		tlsSettings: tlsConfigSettings{
-			Enabled: true,
-			TLSConfig: dnsforward.TLSConfig{
-				CertificateChain: string(testCertChainData),
-				PrivateKey:       string(testPrivateKeyData),
-			},
+			Enabled:          true,
+			CertificateChain: string(testCertChainData),
+			PrivateKey:       string(testPrivateKeyData),
 		},
 		servePlainDNS: false,
 	})
@@ -434,11 +427,9 @@ func TestTLSManager_HandleTLSValidate(t *testing.T) {

 	setts := &tlsConfigSettingsExt{
 		tlsConfigSettings: tlsConfigSettings{
-			Enabled: true,
-			TLSConfig: dnsforward.TLSConfig{
-				CertificateChain: base64.StdEncoding.EncodeToString(testCertChainData),
-				PrivateKey:       base64.StdEncoding.EncodeToString(testPrivateKeyData),
-			},
+			Enabled:          true,
+			CertificateChain: base64.StdEncoding.EncodeToString(testCertChainData),
+			PrivateKey:       base64.StdEncoding.EncodeToString(testPrivateKeyData),
 		},
 	}

@@ -476,6 +467,7 @@ func TestTLSManager_HandleTLSConfigure(t *testing.T) {
 	require.NoError(t, err)

 	err = globalContext.dnsServer.Prepare(&dnsforward.ServerConfig{
+		TLSConf: &dnsforward.TLSConfig{},
 		Config: dnsforward.Config{
 			UpstreamMode:     dnsforward.UpstreamModeLoadBalance,
 			EDNSClientSubnet: &dnsforward.EDNSClientSubnet{Enabled: false},
@@ -511,11 +503,9 @@ func TestTLSManager_HandleTLSConfigure(t *testing.T) {
 		logger:         logger,
 		configModified: func() {},
 		tlsSettings: tlsConfigSettings{
-			Enabled: true,
-			TLSConfig: dnsforward.TLSConfig{
-				CertificatePath: certPath,
-				PrivateKeyPath:  keyPath,
-			},
+			Enabled:         true,
+			CertificatePath: certPath,
+			PrivateKeyPath:  keyPath,
 		},
 		servePlainDNS: true,
 	})
@@ -526,19 +516,16 @@ func TestTLSManager_HandleTLSConfigure(t *testing.T) {

 	m.setWebAPI(web)

-	conf := &tlsConfigSettings{}
-	m.WriteDiskConfig(conf)
+	conf := m.config()
 	assertCertSerialNumber(t, conf, wantSerialNumber)

 	// Prepare a request with the new TLS configuration.
 	setts := &tlsConfigSettingsExt{
 		tlsConfigSettings: tlsConfigSettings{
-			Enabled:   true,
-			PortHTTPS: 4433,
-			TLSConfig: dnsforward.TLSConfig{
-				CertificateChain: base64.StdEncoding.EncodeToString(testCertChainData),
-				PrivateKey:       base64.StdEncoding.EncodeToString(testPrivateKeyData),
-			},
+			Enabled:          true,
+			PortHTTPS:        4433,
+			CertificateChain: base64.StdEncoding.EncodeToString(testCertChainData),
+			PrivateKey:       base64.StdEncoding.EncodeToString(testPrivateKeyData),
 		},
 	}

--- a/internal/home/web.go
+++ b/internal/home/web.go
@@ -157,8 +157,8 @@ func newWebAPI(ctx context.Context, conf *webConfig) (w *webAPI) {
 }

 // tlsConfigChanged updates the TLS configuration and restarts the HTTPS server
-// if necessary.
-func (web *webAPI) tlsConfigChanged(ctx context.Context, tlsConf tlsConfigSettings) {
+// if necessary.  tlsConf must not be nil.
+func (web *webAPI) tlsConfigChanged(ctx context.Context, tlsConf *tlsConfigSettings) {
 	defer slogutil.RecoverAndExit(ctx, web.logger, osutil.ExitCodeFailure)

 	web.logger.DebugContext(ctx, "applying new tls configuration")