all: Deprecate TLS 1.2 on sync connections (fixes #7594) (#7598)

This makes us use TLS 1.3+ on sync connections by default. A new option
`insecureAllowOldTLSVersions` exists to allow communication with TLS
1.2-only clients (roughly Syncthing 1.2.2 and older). Even with that
option set you get a slightly simplified setup, with the cipher suite
order fixed instead of auto detected.

go.mod

@@ -51,6 +51,7 @@ require (
 	golang.org/x/text v0.3.4
 	golang.org/x/time v0.0.0-20200630173020-3af7569d3a1e
 	golang.org/x/tools v0.1.0 // indirect
+	google.golang.org/protobuf v1.23.0 // indirect
 	gopkg.in/check.v1 v1.0.0-20200902074654-038fdea0a05b // indirect
 )
 

lib/api/api.go

@@ -162,7 +162,7 @@ func (s *service) getListener(guiCfg config.GUIConfiguration) (net.Listener, err
 	if err != nil {
 		return nil, err
 	}
-	tlsCfg := tlsutil.SecureDefault()
+	tlsCfg := tlsutil.SecureDefaultWithTLS12()
 	tlsCfg.Certificates = []tls.Certificate{cert}
 
 	if guiCfg.Network() == "unix" {

lib/config/observed.pb.go

@@ -7,9 +7,9 @@ import (
 	fmt "fmt"
 	proto "github.com/gogo/protobuf/proto"
 	github_com_gogo_protobuf_types "github.com/gogo/protobuf/types"
-	_ "github.com/golang/protobuf/ptypes/timestamp"
 	github_com_syncthing_syncthing_lib_protocol "github.com/syncthing/syncthing/lib/protocol"
 	_ "github.com/syncthing/syncthing/proto/ext"
+	_ "google.golang.org/protobuf/types/known/timestamppb"
 	io "io"
 	math "math"
 	math_bits "math/bits"

lib/config/optionsconfiguration.pb.go

@@ -81,6 +81,9 @@ type OptionsConfiguration struct {
 	// meaning no limit. Affects incoming connections and prevents
 	// attempting outgoing connections.
 	ConnectionLimitMax int `protobuf:"varint,52,opt,name=connection_limit_max,json=connectionLimitMax,proto3,casttype=int" json:"connectionLimitMax" xml:"connectionLimitMax"`
+	// When set, this allows TLS 1.2 on sync connections, where we otherwise
+	// default to TLS 1.3+ only.
+	InsecureAllowOldTLSVersions bool `protobuf:"varint,53,opt,name=insecure_allow_old_tls_versions,json=insecureAllowOldTlsVersions,proto3" json:"insecureAllowOldTLSVersions" xml:"insecureAllowOldTLSVersions"`
 	// Legacy deprecated
 	DeprecatedUPnPEnabled        bool     `protobuf:"varint,9000,opt,name=upnp_enabled,json=upnpEnabled,proto3" json:"-" xml:"upnpEnabled,omitempty"`                                    // Deprecated: Do not use.
 	DeprecatedUPnPLeaseM         int      `protobuf:"varint,9001,opt,name=upnp_lease_m,json=upnpLeaseM,proto3,casttype=int" json:"-" xml:"upnpLeaseMinutes,omitempty"`                   // Deprecated: Do not use.
@@ -133,209 +136,213 @@ func init() {
 }
 
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+	0x96, 0x83, 0x37, 0x5d, 0x1b, 0x5b, 0x04, 0x35, 0x31, 0xe5, 0xe1, 0x34, 0x29, 0x84, 0x8c, 0x5a,
+	0x7e, 0xbd, 0x34, 0x74, 0x37, 0x6d, 0x04, 0x45, 0x9b, 0x19, 0xbc, 0x79, 0x87, 0xab, 0xb7, 0x23,
+	0xf3, 0x92, 0x5f, 0x81, 0x5c, 0x1b, 0x0b, 0xf4, 0x2e, 0x99, 0x8e, 0x4d, 0x75, 0x22, 0xf3, 0x25,
+	0x41, 0xf0, 0x21, 0x74, 0xbb, 0x2f, 0x4a, 0x5e, 0xc5, 0x75, 0xe1, 0x01, 0x1f, 0x86, 0x05, 0xf8,
+	0xaa, 0x7e, 0x8e, 0x87, 0x31, 0xcb, 0x25, 0x0e, 0xde, 0xb6, 0xf8, 0x4a, 0x5e, 0xf5, 0x7c, 0x7b,
+	0x83, 0x1a, 0x97, 0xc4, 0x96, 0xe6, 0x8b, 0x06, 0x70, 0x85, 0x39, 0x8e, 0x2f, 0xb8, 0x64, 0x4a,
+	0xa0, 0xd9, 0xad, 0x6d, 0x15, 0x52, 0x66, 0xca, 0x71, 0xfe, 0x0b, 0x15, 0x96, 0xc0, 0xdf, 0x79,
+	0xba, 0x4b, 0x90, 0xbd, 0x81, 0x1d, 0x8b, 0xf8, 0xcc, 0x6d, 0xb8, 0x36, 0x8a, 0xef, 0x1f, 0x1c,
+	0x6a, 0xd4, 0xc5, 0xfc, 0xbe, 0xcf, 0x87, 0x7b, 0x70, 0x25, 0x56, 0xba, 0x23, 0xe9, 0xcc, 0xcd,
+	0xf0, 0xd1, 0x1e, 0x0c, 0x95, 0x48, 0x27, 0x32, 0x2f, 0xc4, 0xa1, 0x5d, 0x05, 0x8b, 0xbb, 0x4a,
+	0x25, 0xd2, 0xd9, 0xab, 0x77, 0xb1, 0xb8, 0xbb, 0x5f, 0xef, 0xc2, 0x02, 0x2a, 0x5b, 0x38, 0x14,
+	0x40, 0xfd, 0x34, 0x0b, 0x50, 0xa3, 0xe1, 0xda, 0x96, 0xed, 0x21, 0x4a, 0x8d, 0xcb, 0x62, 0x58,
+	0x5f, 0xe0, 0xf5, 0x72, 0x02, 0x4c, 0x73, 0x79, 0x27, 0x32, 0x41, 0x3c, 0xa0, 0x92, 0x30, 0xbb,
+	0xa8, 0x29, 0xa8, 0x82, 0xb7, 0xf5, 0xfe, 0x64, 0x88, 0xad, 0x86, 0xef, 0x39, 0x38, 0xb0, 0x5a,
+	0x88, 0xad, 0x1b, 0x4f, 0x89, 0x5d, 0x7f, 0xfb, 0x20, 0x32, 0x2f, 0xcc, 0xe0, 0x56, 0x80, 0x6d,
+	0xc4, 0xb0, 0x33, 0x13, 0x2b, 0xce, 0x0a, 0xbd, 0x45, 0xc4, 0xd6, 0xdb, 0x91, 0xa9, 0xbd, 0x90,
+	0x55, 0xe7, 0x4e, 0x19, 0x7e, 0xde, 0x6f, 0xba, 0x7c, 0x92, 0xd8, 0x4e, 0xcd, 0xd0, 0x60, 0x5f,
+	0x05, 0x07, 0x1b, 0xfa, 0x59, 0x8a, 0x99, 0xe5, 0xf9, 0x5b, 0x56, 0x2b, 0x70, 0xfd, 0xc0, 0x65,
+	0x3b, 0xc6, 0xd3, 0x62, 0x53, 0x4c, 0xb6, 0x23, 0xb3, 0x97, 0x62, 0x36, 0xef, 0x6f, 0x2d, 0x26,
+	0x48, 0x16, 0xd9, 0x8a, 0xe2, 0xae, 0x29, 0x46, 0xa9, 0x39, 0xf8, 0x40, 0xd3, 0x07, 0x9b, 0x68,
+	0x3b, 0x75, 0xd3, 0xf6, 0x89, 0x1d, 0x06, 0x01, 0x26, 0xf6, 0x8e, 0x31, 0x2a, 0xc6, 0x91, 0x8a,
+	0xcb, 0x16, 0xb4, 0xb5, 0x80, 0xb6, 0x63, 0x8e, 0xd3, 0xb9, 0x0a, 0x3f, 0xf2, 0x9b, 0x0a, 0x79,
+	0x76, 0xe4, 0xab, 0xc0, 0x74, 0xc8, 0xc5, 0xed, 0x88, 0xda, 0x2e, 0x54, 0x5a, 0x05, 0x9f, 0x6a,
+	0x7a, 0xbf, 0x1d, 0x20, 0xba, 0x5e, 0xaa, 0x01, 0x9e, 0x11, 0xd3, 0xf2, 0xa1, 0xa8, 0x01, 0xa6,
+	0xd3, 0x1a, 0xc0, 0x4e, 0x6a, 0x80, 0xd9, 0xf8, 0x6c, 0xe6, 0xcd, 0xf2, 0x6c, 0x5c, 0x19, 0x86,
+	0x85, 0x4e, 0x35, 0xaf, 0x17, 0x62, 0xbe, 0x96, 0xfb, 0x2a, 0x46, 0x78, 0x75, 0x60, 0x27, 0xd5,
+	0x41, 0xfd, 0x61, 0xcc, 0xf0, 0xfa, 0x60, 0x3a, 0xae, 0x0f, 0x4a, 0xc6, 0x02, 0x0f, 0xfc, 0x44,
+	0xd3, 0x87, 0xca, 0xee, 0xa5, 0xd7, 0x32, 0xcf, 0x8a, 0xf9, 0x77, 0x0f, 0x22, 0xf3, 0xe4, 0x34,
+	0x94, 0x5e, 0x14, 0x8a, 0x56, 0xca, 0x2f, 0x0a, 0x4a, 0xb4, 0xdb, 0xd2, 0xd8, 0xdd, 0xaf, 0xe7,
+	0xb6, 0xa1, 0xda, 0x32, 0xf8, 0xba, 0xa6, 0x0f, 0x52, 0x16, 0x12, 0x8b, 0x67, 0x4e, 0xc8, 0x73,
+	0x37, 0xb1, 0x15, 0xe7, 0xc3, 0xd4, 0x78, 0x2e, 0xcb, 0x47, 0xfb, 0xb9, 0xc6, 0xed, 0x54, 0x61,
+	0x89, 0xe3, 0x4b, 0x59, 0x96, 0xa4, 0xc0, 0x8a, 0xc9, 0xbc, 0x14, 0xd0, 0x8e, 0x8d, 0xdf, 0x1c,
+	0x83, 0x2a, 0x6b, 0xbc, 0x46, 0x2e, 0xd1, 0xe0, 0x71, 0x95, 0x1a, 0xcf, 0x0b, 0x12, 0xaf, 0xf1,
+	0x44, 0xad, 0xd0, 0x6c, 0xc1, 0x25, 0x79, 0x2d, 0x51, 0x41, 0xe4, 0x1c, 0xb1, 0x10, 0x50, 0x27,
+	0xc6, 0x60, 0xd5, 0x0e, 0xcf, 0xca, 0x7b, 0x44, 0xef, 0xe9, 0x43, 0xd7, 0x0b, 0x22, 0x86, 0x3a,
+	0x07, 0x91, 0xd9, 0x0b, 0xd1, 0xd6, 0x12, 0x0b, 0xa5, 0x27, 0xae, 0x53, 0x34, 0xff, 0xcc, 0x2e,
+	0xa3, 0x72, 0xd9, 0x03, 0x9f, 0xe1, 0x4a, 0x16, 0xa1, 0x6c, 0x0f, 0x6c, 0xea, 0x67, 0x78, 0xd9,
+	0xb9, 0x8a, 0x28, 0xb6, 0xe2, 0x37, 0x47, 0xe3, 0xca, 0x88, 0x36, 0xda, 0x3b, 0xd1, 0x9b, 0xa6,
+	0x45, 0xcb, 0x42, 0x2a, 0x6e, 0x0f, 0x7b, 0x53, 0xd5, 0x58, 0x96, 0x45, 0x8e, 0xa2, 0xb8, 0x36,
+	0x92, 0x14, 0x21, 0xc9, 0xf2, 0x78, 0x67, 0xbf, 0xae, 0xc1, 0x52, 0x53, 0xf0, 0xdd, 0xa3, 0xfa,
+	0x25, 0x1e, 0x35, 0xb2, 0x70, 0xc1, 0x8b, 0x58, 0xdb, 0x6f, 0xf2, 0x25, 0x1b, 0xe0, 0x37, 0x43,
+	0x4c, 0x99, 0xb5, 0xe1, 0xae, 0x1a, 0x57, 0xc5, 0x74, 0xfc, 0x59, 0x4b, 0xde, 0x2a, 0x17, 0xd0,
+	0xf6, 0xf4, 0x1c, 0x8c, 0xf1, 0xdb, 0xee, 0x54, 0x3b, 0x32, 0xcd, 0x26, 0xda, 0xce, 0xb6, 0x38,
+	0x9b, 0x4b, 0x6c, 0xe4, 0x2a, 0xd9, 0x29, 0xf8, 0x00, 0x3d, 0xa9, 0x00, 0x7c, 0xa0, 0xc9, 0x07,
+	0xab, 0x24, 0xaf, 0x9f, 0x25, 0xba, 0xf0, 0x01, 0xcd, 0x56, 0xc1, 0xe7, 0x9a, 0x3e, 0x98, 0x3d,
+	0xc1, 0x78, 0x48, 0x7e, 0xb4, 0x1d, 0x13, 0x1b, 0xf8, 0x23, 0x3e, 0x12, 0x03, 0xe9, 0x13, 0xc6,
+	0xfc, 0xe4, 0x1d, 0xf9, 0xdd, 0x76, 0x00, 0x29, 0xe4, 0x59, 0x22, 0xad, 0x02, 0x55, 0x2f, 0x67,
+	0x4a, 0x23, 0x5d, 0xe4, 0xd2, 0xd6, 0x57, 0x92, 0x82, 0x79, 0x2b, 0x24, 0x3d, 0xfa, 0x6e, 0xea,
+	0xe7, 0xc5, 0x2b, 0x4b, 0x23, 0xf4, 0xbc, 0x24, 0xab, 0xf1, 0x49, 0x5a, 0xa2, 0x1a, 0xe3, 0xc2,
+	0xd3, 0x5b, 0x3c, 0x6b, 0xe0, 0x5a, 0xb3, 0xa1, 0xe7, 0x89, 0x7c, 0xe4, 0x2e, 0x49, 0x8a, 0xca,
+	0x4e, 0x64, 0x5e, 0x4c, 0x8e, 0x2c, 0x15, 0x5c, 0x83, 0x5d, 0xda, 0x81, 0xd7, 0xf4, 0xd3, 0x0d,
+	0x8c, 0x58, 0x18, 0x60, 0xab, 0xe1, 0xa1, 0x35, 0x6a, 0x4c, 0x88, 0x7d, 0x77, 0x99, 0x9f, 0xf4,
+	0x09, 0x30, 0xcb, 0xe5, 0xd9, 0x8b, 0x8c, 0x24, 0xac, 0xc1, 0x82, 0x0a, 0xd8, 0xd2, 0x87, 0xa4,
+	0x87, 0x98, 0xb8, 0xc6, 0xc1, 0xc4, 0x0f, 0xd7, 0xd6, 0x8d, 0x6b, 0x62, 0xd1, 0xbe, 0x2c, 0xc2,
+	0x6b, 0xa6, 0x32, 0xcf, 0x35, 0x5e, 0x11, 0x0a, 0x59, 0xd6, 0xa3, 0x44, 0xb3, 0x8c, 0x42, 0xdd,
+	0x18, 0x6c, 0xe8, 0x03, 0x95, 0x8e, 0x9b, 0x68, 0xdb, 0xb8, 0x2e, 0x7a, 0x7d, 0x89, 0x27, 0x83,
+	0xa5, 0x86, 0x0b, 0x68, 0xbb, 0x13, 0x99, 0x86, 0xaa, 0xcb, 0x05, 0xb4, 0x9d, 0xf5, 0xa7, 0x68,
+	0x06, 0xde, 0x3b, 0xaa, 0x9b, 0xe9, 0xed, 0x92, 0x85, 0x3c, 0x9e, 0x52, 0xf8, 0x9e, 0x63, 0x31,
+	0x8f, 0x5a, 0x3c, 0x7e, 0xb8, 0x3e, 0xa1, 0xc6, 0x8b, 0x62, 0xbe, 0x3e, 0xe6, 0x2b, 0xf3, 0x42,
+	0x7a, 0x97, 0x33, 0xc9, 0x55, 0xef, 0x7a, 0xce, 0xf2, 0xfc, 0xd2, 0xff, 0x25, 0x7a, 0xed, 0xc8,
+	0xbc, 0xe0, 0x76, 0x87, 0xb3, 0x7c, 0xe7, 0x3e, 0x3a, 0x7c, 0x7d, 0xde, 0xd7, 0xc6, 0xfd, 0xe1,
+	0xdd, 0xfd, 0xfa, 0xfd, 0x08, 0xc2, 0x6a, 0x5b, 0x8f, 0xa6, 0x20, 0xf8, 0xb2, 0xde, 0x13, 0xb6,
+	0x48, 0x2b, 0x3b, 0x50, 0x7f, 0x31, 0x2b, 0xdc, 0xfe, 0xff, 0x83, 0xc8, 0x3c, 0x97, 0xe7, 0x72,
+	0x2b, 0x8b, 0x64, 0x31, 0x3f, 0x5d, 0x45, 0x16, 0x97, 0x24, 0xb8, 0x2d, 0xd2, 0x4a, 0x00, 0x29,
+	0x7f, 0xdb, 0xdd, 0xaf, 0xab, 0x1b, 0x1b, 0x1a, 0x3c, 0x25, 0x35, 0x01, 0x3f, 0xd3, 0x92, 0xee,
+	0xd3, 0xe7, 0x8b, 0x0f, 0x66, 0xc5, 0x74, 0xbf, 0x23, 0xe2, 0x41, 0xd1, 0x44, 0xf6, 0x94, 0x21,
+	0xba, 0x1f, 0xc9, 0xba, 0x97, 0x9f, 0x20, 0x24, 0x0e, 0x79, 0xe0, 0x3b, 0xdf, 0x5d, 0x8b, 0x6f,
+	0x70, 0x55, 0x2f, 0x86, 0x06, 0xf5, 0xbc, 0x15, 0xf8, 0x8d, 0xa6, 0xf7, 0x0a, 0x9a, 0xf9, 0x43,
+	0xc5, 0x2f, 0x63, 0xa2, 0xdf, 0x14, 0xf5, 0x41, 0xd1, 0x84, 0xf4, 0x68, 0x21, 0xa8, 0xd6, 0x32,
+	0xaa, 0xc5, 0x67, 0x06, 0x25, 0xd9, 0x8b, 0xf7, 0xd3, 0xe3, 0x55, 0x80, 0xba, 0x2f, 0x43, 0x83,
+	0x3d, 0x72, 0xcb, 0x9c, 0x72, 0xfe, 0x1c, 0xf1, 0x61, 0x77, 0xca, 0xd2, 0xd3, 0x44, 0x89, 0x72,
+	0xf1, 0x31, 0xa1, 0x3b, 0xe5, 0x6e, 0x7a, 0x55, 0xca, 0xa9, 0x66, 0x4a, 0x39, 0x7b, 0x7d, 0x68,
+	0xe8, 0xf1, 0xb3, 0x67, 0x96, 0x3e, 0xfc, 0x6a, 0x56, 0xc4, 0xb1, 0xff, 0x29, 0xf2, 0x15, 0x2f,
+	0x87, 0x79, 0x1e, 0x21, 0x2d, 0xc6, 0x20, 0x47, 0x8a, 0xc5, 0x44, 0x8f, 0x84, 0x50, 0x71, 0x79,
+	0x53, 0xbd, 0x37, 0xb1, 0x5a, 0x36, 0x33, 0x3e, 0xe2, 0x43, 0xa4, 0x4d, 0x2d, 0x1c, 0x44, 0xe6,
+	0xc5, 0xbc, 0xc7, 0x85, 0xe2, 0xad, 0xc7, 0xa2, 0xcd, 0x8a, 0xe3, 0xd4, 0xac, 0xe0, 0xc5, 0xee,
+	0x41, 0x55, 0x81, 0xe7, 0x4a, 0x03, 0xa5, 0x4c, 0x81, 0xda, 0x88, 0x50, 0xe3, 0xd7, 0xf1, 0x2c,
+	0x2d, 0x97, 0x28, 0xc8, 0x27, 0xec, 0x12, 0x57, 0x2c, 0x51, 0xa8, 0xe0, 0xd5, 0xa9, 0x12, 0x4c,
+	0x2a, 0x7a, 0x53, 0xb7, 0x3f, 0xf9, 0x6c, 0xf8, 0xc8, 0xfe, 0x67, 0xc3, 0x47, 0x3e, 0x39, 0x18,
+	0xd6, 0xf6, 0x0f, 0x86, 0xb5, 0x6f, 0xdf, 0x1b, 0x3e, 0xf2, 0xfe, 0xbd, 0x61, 0x6d, 0xff, 0xde,
+	0xf0, 0x91, 0xbf, 0xdd, 0x1b, 0x3e, 0xf2, 0xc6, 0x33, 0x6b, 0x2e, 0x5b, 0x0f, 0x57, 0xaf, 0xd8,
+	0x7e, 0xf3, 0x6a, 0x96, 0xbf, 0x4b, 0xbf, 0xf2, 0xff, 0x71, 0xad, 0x9e, 0x10, 0x7f, 0xdc, 0xba,
+	0xf6, 0x9f, 0x00, 0x00, 0x00, 0xff, 0xff, 0x1c, 0x3d, 0xe9, 0x4b, 0x24, 0x26, 0x00, 0x00,
 }
 
 func (m *OptionsConfiguration) Marshal() (dAtA []byte, err error) {
@@ -431,6 +438,18 @@ func (m *OptionsConfiguration) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 		i--
 		dAtA[i] = 0xc0
 	}
+	if m.InsecureAllowOldTLSVersions {
+		i--
+		if m.InsecureAllowOldTLSVersions {
+			dAtA[i] = 1
+		} else {
+			dAtA[i] = 0
+		}
+		i--
+		dAtA[i] = 0x3
+		i--
+		dAtA[i] = 0xa8
+	}
 	if m.ConnectionLimitMax != 0 {
 		i = encodeVarintOptionsconfiguration(dAtA, i, uint64(m.ConnectionLimitMax))
 		i--
@@ -1072,6 +1091,9 @@ func (m *OptionsConfiguration) ProtoSize() (n int) {
 	if m.ConnectionLimitMax != 0 {
 		n += 2 + sovOptionsconfiguration(uint64(m.ConnectionLimitMax))
 	}
+	if m.InsecureAllowOldTLSVersions {
+		n += 3
+	}
 	if m.DeprecatedUPnPEnabled {
 		n += 4
 	}
@@ -2288,6 +2310,26 @@ func (m *OptionsConfiguration) Unmarshal(dAtA []byte) error {
 					break
 				}
 			}
+		case 53:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field InsecureAllowOldTLSVersions", wireType)
+			}
+			var v int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowOptionsconfiguration
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				v |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			m.InsecureAllowOldTLSVersions = bool(v != 0)
 		case 9000:
 			if wireType != 0 {
 				return fmt.Errorf("proto: wrong wireType = %d for field DeprecatedUPnPEnabled", wireType)

lib/db/structs.pb.go

@@ -8,10 +8,10 @@ import (
 	_ "github.com/gogo/protobuf/gogoproto"
 	proto "github.com/gogo/protobuf/proto"
 	github_com_gogo_protobuf_types "github.com/gogo/protobuf/types"
-	_ "github.com/golang/protobuf/ptypes/timestamp"
 	github_com_syncthing_syncthing_lib_protocol "github.com/syncthing/syncthing/lib/protocol"
 	protocol "github.com/syncthing/syncthing/lib/protocol"
 	_ "github.com/syncthing/syncthing/proto/ext"
+	_ "google.golang.org/protobuf/types/known/timestamppb"
 	io "io"
 	math "math"
 	math_bits "math/bits"

lib/syncthing/syncthing.go

@@ -255,7 +255,13 @@ func (a *App) startup() error {
 	// The TLS configuration is used for both the listening socket and outgoing
 	// connections.
 
-	tlsCfg := tlsutil.SecureDefault()
+	var tlsCfg *tls.Config
+	if a.cfg.Options().InsecureAllowOldTLSVersions {
+		l.Infoln("TLS 1.2 is allowed on sync connections. This is less than optimally secure.")
+		tlsCfg = tlsutil.SecureDefaultWithTLS12()
+	} else {
+		tlsCfg = tlsutil.SecureDefaultTLS13()
+	}
 	tlsCfg.Certificates = []tls.Certificate{a.cert}
 	tlsCfg.NextProtos = []string{bepProtocolName}
 	tlsCfg.ClientAuth = tls.RequestClientCert

lib/tlsutil/tlsutil.go

@@ -29,30 +29,22 @@ var (
 )
 
 var (
-	// The list of cipher suites we will use / suggest for TLS connections.
-	// This is built based on the component slices below, depending on what
-	// the hardware prefers.
-	cipherSuites []uint16
-
-	// Suites that are good and fast on hardware with AES-NI. These are
-	// reordered from the Go default to put the 256 bit ciphers above the
-	// 128 bit ones - because that looks cooler, even though there is
-	// probably no relevant difference in strength yet.
-	gcmSuites = []uint16{
+	// The list of cipher suites we will use / suggest for TLS 1.2 connections.
+	cipherSuites = []uint16{
+		// Suites that are good and fast on hardware *without* AES-NI.
+		tls.TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,
+		tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,
+
+		// Suites that are good and fast on hardware with AES-NI. These are
+		// reordered from the Go default to put the 256 bit ciphers above the
+		// 128 bit ones - because that looks cooler, even though there is
+		// probably no relevant difference in strength yet.
 		tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
 		tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
 		tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
 		tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
-	}
-
-	// Suites that are good and fast on hardware *without* AES-NI.
-	chaChaSuites = []uint16{
-		tls.TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,
-		tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,
-	}
 
-	// The rest of the suites, minus DES stuff.
-	otherSuites = []uint16{
+		// The rest of the suites, minus DES stuff.
 		tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,
 		tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
 		tls.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256,
@@ -67,13 +59,18 @@ var (
 	}
 )
 
-func init() {
-	// Creates the list of ciper suites that SecureDefault uses.
-	cipherSuites = buildCipherSuites()
+// SecureDefault returns a tls.Config with reasonable, secure defaults set.
+// This variant allows only TLS 1.3.
+func SecureDefaultTLS13() *tls.Config {
+	return &tls.Config{
+		// TLS 1.3 is the minimum we accept
+		MinVersion: tls.VersionTLS13,
+	}
 }
 
-// SecureDefault returns a tls.Config with reasonable, secure defaults set.
-func SecureDefault() *tls.Config {
+// SecureDefaultWithTLS12 returns a tls.Config with reasonable, secure
+// defaults set. This variant allows TLS 1.2.
+func SecureDefaultWithTLS12() *tls.Config {
 	// paranoia
 	cs := make([]uint16, len(cipherSuites))
 	copy(cs, cipherSuites)
@@ -245,79 +242,3 @@ func pemBlockForKey(priv interface{}) (*pem.Block, error) {
 		return nil, errors.New("unknown key type")
 	}
 }
-
-// buildCipherSuites returns a list of cipher suites with either AES-GCM or
-// ChaCha20 at the top. This takes advantage of the CPU detection that the
-// TLS package does to create an optimal cipher suite list for the current
-// hardware.
-func buildCipherSuites() []uint16 {
-	pref := preferredCipherSuite()
-	for _, suite := range gcmSuites {
-		if suite == pref {
-			// Go preferred an AES-GCM suite. Use those first.
-			return append(gcmSuites, append(chaChaSuites, otherSuites...)...)
-		}
-	}
-	// Use ChaCha20 at the top, then AES-GCM etc.
-	return append(chaChaSuites, append(gcmSuites, otherSuites...)...)
-}
-
-// preferredCipherSuite returns the cipher suite that is selected for a TLS
-// connection made with the Go defaults to ourselves. This is (currently,
-// probably) either a ChaCha20 suite or an AES-GCM suite, depending on what
-// the CPU detection has decided is fastest on this hardware.
-//
-// The function will return zero if something odd happens, and there's no
-// guarantee what cipher suite would be chosen anyway, so the return value
-// should be taken with a grain of salt.
-func preferredCipherSuite() uint16 {
-	// This is one of our certs from NewCertificate above, to avoid having
-	// to generate one at init time just for this function.
-	crtBs := []byte(`-----BEGIN CERTIFICATE-----
-MIIBXDCCAQOgAwIBAgIIQUODl2/bE4owCgYIKoZIzj0EAwIwFDESMBAGA1UEAxMJ
-c3luY3RoaW5nMB4XDTE4MTAxNDA2MjU0M1oXDTQ5MTIzMTIzNTk1OVowFDESMBAG
-A1UEAxMJc3luY3RoaW5nMFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEMqP+1lL4
-0s/xtI3ygExzYc/GvLHr0qetpBrUVHaDwS/cR1yXDsYaJpJcUNtrf1XK49IlpWW1
-Ds8seQsSg7/9BaM/MD0wDgYDVR0PAQH/BAQDAgWgMB0GA1UdJQQWMBQGCCsGAQUF
-BwMBBggrBgEFBQcDAjAMBgNVHRMBAf8EAjAAMAoGCCqGSM49BAMCA0cAMEQCIFxY
-MDBA92FKqZYSZjmfdIbT1OI6S9CnAFvL/pJZJwNuAiAV7osre2NiCHtXABOvsGrH
-vKWqDvXcHr6Tlo+LmTAdyg==
------END CERTIFICATE-----
-	`)
-	keyBs := []byte(`-----BEGIN EC PRIVATE KEY-----
-MHcCAQEEIHtPxVHlj6Bhi9RgSR2/lAtIQ7APM9wmpaJAcds6TD2CoAoGCCqGSM49
-AwEHoUQDQgAEMqP+1lL40s/xtI3ygExzYc/GvLHr0qetpBrUVHaDwS/cR1yXDsYa
-JpJcUNtrf1XK49IlpWW1Ds8seQsSg7/9BQ==
------END EC PRIVATE KEY-----
-	`)
-
-	cert, err := tls.X509KeyPair(crtBs, keyBs)
-	if err != nil {
-		return 0
-	}
-
-	serverCfg := &tls.Config{
-		MinVersion:               tls.VersionTLS12,
-		PreferServerCipherSuites: true,
-		Certificates:             []tls.Certificate{cert},
-	}
-
-	clientCfg := &tls.Config{
-		MinVersion:         tls.VersionTLS12,
-		InsecureSkipVerify: true,
-	}
-
-	c0, c1 := net.Pipe()
-
-	c := tls.Client(c0, clientCfg)
-	go func() {
-		c.Handshake()
-	}()
-
-	s := tls.Server(c1, serverCfg)
-	if err := s.Handshake(); err != nil {
-		return 0
-	}
-
-	return c.ConnectionState().CipherSuite
-}

lib/tlsutil/tlsutil_test.go

@@ -98,7 +98,7 @@ func TestCheckCipherSuites(t *testing.T) {
 		tls.TLS_RSA_WITH_AES_256_CBC_SHA,
 	}
 
-	suites := buildCipherSuites()
+	suites := SecureDefaultWithTLS12().CipherSuites
 
 	if len(suites) != len(allSuites) {
 		t.Fatal("should get a list representing all suites")

proto/lib/config/optionsconfiguration.proto

@@ -67,6 +67,10 @@ message OptionsConfiguration {
     // attempting outgoing connections.
     int32 connection_limit_max = 52;
 
+    // When set, this allows TLS 1.2 on sync connections, where we otherwise
+    // default to TLS 1.3+ only.
+    bool insecure_allow_old_tls_versions = 53 [(ext.goname)= "InsecureAllowOldTLSVersions", (ext.xml) = "insecureAllowOldTLSVersions", (ext.json) = "insecureAllowOldTLSVersions"];
+
     // Legacy deprecated
     bool            upnp_enabled           = 9000 [deprecated = true, (ext.goname) = "DeprecatedUPnPEnabled"];
     int32           upnp_lease_m           = 9001 [deprecated = true, (ext.goname) = "DeprecatedUPnPLeaseM", (ext.xml) = "upnpLeaseMinutes,omitempty"];