Feature: add tls SNI sniffing (#68)
This commit is contained in:
gVisor bot
parent
58e51e8f21
commit
016d88e5ea
5 changed files with 337 additions and 0 deletions
148
common/snifer/tls/sniff.go
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148
common/snifer/tls/sniff.go
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@ -0,0 +1,148 @@
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package tls
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import (
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"encoding/binary"
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"errors"
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"strings"
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)
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var ErrNoClue = errors.New("not enough information for making a decision")
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type SniffHeader struct {
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domain string
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}
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func (h *SniffHeader) Protocol() string {
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return "tls"
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}
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func (h *SniffHeader) Domain() string {
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return h.domain
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}
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var (
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errNotTLS = errors.New("not TLS header")
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errNotClientHello = errors.New("not client hello")
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)
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func IsValidTLSVersion(major, minor byte) bool {
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return major == 3
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}
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// ReadClientHello returns server name (if any) from TLS client hello message.
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// https://github.com/golang/go/blob/master/src/crypto/tls/handshake_messages.go#L300
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func ReadClientHello(data []byte, h *SniffHeader) error {
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if len(data) < 42 {
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return ErrNoClue
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}
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sessionIDLen := int(data[38])
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if sessionIDLen > 32 || len(data) < 39+sessionIDLen {
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return ErrNoClue
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}
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data = data[39+sessionIDLen:]
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if len(data) < 2 {
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return ErrNoClue
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}
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// cipherSuiteLen is the number of bytes of cipher suite numbers. Since
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// they are uint16s, the number must be even.
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cipherSuiteLen := int(data[0])<<8 | int(data[1])
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if cipherSuiteLen%2 == 1 || len(data) < 2+cipherSuiteLen {
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return errNotClientHello
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}
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data = data[2+cipherSuiteLen:]
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if len(data) < 1 {
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return ErrNoClue
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}
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compressionMethodsLen := int(data[0])
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if len(data) < 1+compressionMethodsLen {
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return ErrNoClue
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}
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data = data[1+compressionMethodsLen:]
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if len(data) == 0 {
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return errNotClientHello
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}
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if len(data) < 2 {
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return errNotClientHello
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}
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extensionsLength := int(data[0])<<8 | int(data[1])
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data = data[2:]
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if extensionsLength != len(data) {
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return errNotClientHello
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}
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for len(data) != 0 {
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if len(data) < 4 {
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return errNotClientHello
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}
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extension := uint16(data[0])<<8 | uint16(data[1])
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length := int(data[2])<<8 | int(data[3])
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data = data[4:]
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if len(data) < length {
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return errNotClientHello
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}
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if extension == 0x00 { /* extensionServerName */
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d := data[:length]
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if len(d) < 2 {
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return errNotClientHello
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}
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namesLen := int(d[0])<<8 | int(d[1])
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d = d[2:]
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if len(d) != namesLen {
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return errNotClientHello
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}
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for len(d) > 0 {
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if len(d) < 3 {
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return errNotClientHello
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}
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nameType := d[0]
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nameLen := int(d[1])<<8 | int(d[2])
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d = d[3:]
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if len(d) < nameLen {
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return errNotClientHello
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}
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if nameType == 0 {
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serverName := string(d[:nameLen])
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// An SNI value may not include a
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// trailing dot. See
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// https://tools.ietf.org/html/rfc6066#section-3.
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if strings.HasSuffix(serverName, ".") {
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return errNotClientHello
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}
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h.domain = serverName
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return nil
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}
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d = d[nameLen:]
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}
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}
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data = data[length:]
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}
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return errNotTLS
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}
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func SniffTLS(b []byte) (*SniffHeader, error) {
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if len(b) < 5 {
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return nil, ErrNoClue
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}
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if b[0] != 0x16 /* TLS Handshake */ {
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return nil, errNotTLS
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}
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if !IsValidTLSVersion(b[1], b[2]) {
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return nil, errNotTLS
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}
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headerLen := int(binary.BigEndian.Uint16(b[3:5]))
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if 5+headerLen > len(b) {
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return nil, ErrNoClue
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}
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h := &SniffHeader{}
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err := ReadClientHello(b[5:5+headerLen], h)
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if err == nil {
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return h, nil
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}
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return nil, err
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}
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159
common/snifer/tls/sniff_test.go
Normal file
159
common/snifer/tls/sniff_test.go
Normal file
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@ -0,0 +1,159 @@
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package tls
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import (
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"testing"
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)
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func TestTLSHeaders(t *testing.T) {
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cases := []struct {
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input []byte
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domain string
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err bool
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}{
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{
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input: []byte{
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0x16, 0x03, 0x01, 0x00, 0xc8, 0x01, 0x00, 0x00,
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0xc4, 0x03, 0x03, 0x1a, 0xac, 0xb2, 0xa8, 0xfe,
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0xb4, 0x96, 0x04, 0x5b, 0xca, 0xf7, 0xc1, 0xf4,
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0x2e, 0x53, 0x24, 0x6e, 0x34, 0x0c, 0x58, 0x36,
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0x71, 0x97, 0x59, 0xe9, 0x41, 0x66, 0xe2, 0x43,
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0xa0, 0x13, 0xb6, 0x00, 0x00, 0x20, 0x1a, 0x1a,
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0xc0, 0x2b, 0xc0, 0x2f, 0xc0, 0x2c, 0xc0, 0x30,
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0xcc, 0xa9, 0xcc, 0xa8, 0xcc, 0x14, 0xcc, 0x13,
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0xc0, 0x13, 0xc0, 0x14, 0x00, 0x9c, 0x00, 0x9d,
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0x00, 0x2f, 0x00, 0x35, 0x00, 0x0a, 0x01, 0x00,
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0x00, 0x7b, 0xba, 0xba, 0x00, 0x00, 0xff, 0x01,
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0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x16, 0x00,
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0x14, 0x00, 0x00, 0x11, 0x63, 0x2e, 0x73, 0x2d,
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0x6d, 0x69, 0x63, 0x72, 0x6f, 0x73, 0x6f, 0x66,
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0x74, 0x2e, 0x63, 0x6f, 0x6d, 0x00, 0x17, 0x00,
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0x00, 0x00, 0x23, 0x00, 0x00, 0x00, 0x0d, 0x00,
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0x14, 0x00, 0x12, 0x04, 0x03, 0x08, 0x04, 0x04,
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0x01, 0x05, 0x03, 0x08, 0x05, 0x05, 0x01, 0x08,
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0x06, 0x06, 0x01, 0x02, 0x01, 0x00, 0x05, 0x00,
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0x05, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x12,
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0x00, 0x00, 0x00, 0x10, 0x00, 0x0e, 0x00, 0x0c,
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0x02, 0x68, 0x32, 0x08, 0x68, 0x74, 0x74, 0x70,
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0x2f, 0x31, 0x2e, 0x31, 0x00, 0x0b, 0x00, 0x02,
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0x01, 0x00, 0x00, 0x0a, 0x00, 0x0a, 0x00, 0x08,
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0xaa, 0xaa, 0x00, 0x1d, 0x00, 0x17, 0x00, 0x18,
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0xaa, 0xaa, 0x00, 0x01, 0x00,
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},
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domain: "c.s-microsoft.com",
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err: false,
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},
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{
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input: []byte{
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0x16, 0x03, 0x01, 0x00, 0xee, 0x01, 0x00, 0x00,
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0xea, 0x03, 0x03, 0xe7, 0x91, 0x9e, 0x93, 0xca,
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0x78, 0x1b, 0x3c, 0xe0, 0x65, 0x25, 0x58, 0xb5,
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0x93, 0xe1, 0x0f, 0x85, 0xec, 0x9a, 0x66, 0x8e,
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0x61, 0x82, 0x88, 0xc8, 0xfc, 0xae, 0x1e, 0xca,
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0xd7, 0xa5, 0x63, 0x20, 0xbd, 0x1c, 0x00, 0x00,
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0x8b, 0xee, 0x09, 0xe3, 0x47, 0x6a, 0x0e, 0x74,
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0xb0, 0xbc, 0xa3, 0x02, 0xa7, 0x35, 0xe8, 0x85,
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0x70, 0x7c, 0x7a, 0xf0, 0x00, 0xdf, 0x4a, 0xea,
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0x87, 0x01, 0x14, 0x91, 0x00, 0x20, 0xea, 0xea,
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0xc0, 0x2b, 0xc0, 0x2f, 0xc0, 0x2c, 0xc0, 0x30,
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0xcc, 0xa9, 0xcc, 0xa8, 0xcc, 0x14, 0xcc, 0x13,
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0xc0, 0x13, 0xc0, 0x14, 0x00, 0x9c, 0x00, 0x9d,
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0x00, 0x2f, 0x00, 0x35, 0x00, 0x0a, 0x01, 0x00,
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0x00, 0x81, 0x9a, 0x9a, 0x00, 0x00, 0xff, 0x01,
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0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x18, 0x00,
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0x16, 0x00, 0x00, 0x13, 0x77, 0x77, 0x77, 0x30,
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0x37, 0x2e, 0x63, 0x6c, 0x69, 0x63, 0x6b, 0x74,
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0x61, 0x6c, 0x65, 0x2e, 0x6e, 0x65, 0x74, 0x00,
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0x17, 0x00, 0x00, 0x00, 0x23, 0x00, 0x00, 0x00,
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0x0d, 0x00, 0x14, 0x00, 0x12, 0x04, 0x03, 0x08,
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0x04, 0x04, 0x01, 0x05, 0x03, 0x08, 0x05, 0x05,
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0x01, 0x08, 0x06, 0x06, 0x01, 0x02, 0x01, 0x00,
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0x05, 0x00, 0x05, 0x01, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x12, 0x00, 0x00, 0x00, 0x10, 0x00, 0x0e,
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0x00, 0x0c, 0x02, 0x68, 0x32, 0x08, 0x68, 0x74,
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0x74, 0x70, 0x2f, 0x31, 0x2e, 0x31, 0x75, 0x50,
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0x00, 0x00, 0x00, 0x0b, 0x00, 0x02, 0x01, 0x00,
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0x00, 0x0a, 0x00, 0x0a, 0x00, 0x08, 0x9a, 0x9a,
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0x00, 0x1d, 0x00, 0x17, 0x00, 0x18, 0x8a, 0x8a,
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0x00, 0x01, 0x00,
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},
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domain: "www07.clicktale.net",
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err: false,
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},
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{
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input: []byte{
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0x16, 0x03, 0x01, 0x00, 0xe6, 0x01, 0x00, 0x00, 0xe2, 0x03, 0x03, 0x81, 0x47, 0xc1,
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0x66, 0xd5, 0x1b, 0xfa, 0x4b, 0xb5, 0xe0, 0x2a, 0xe1, 0xa7, 0x87, 0x13, 0x1d, 0x11, 0xaa, 0xc6,
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0xce, 0xfc, 0x7f, 0xab, 0x94, 0xc8, 0x62, 0xad, 0xc8, 0xab, 0x0c, 0xdd, 0xcb, 0x20, 0x6f, 0x9d,
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0x07, 0xf1, 0x95, 0x3e, 0x99, 0xd8, 0xf3, 0x6d, 0x97, 0xee, 0x19, 0x0b, 0x06, 0x1b, 0xf4, 0x84,
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0x0b, 0xb6, 0x8f, 0xcc, 0xde, 0xe2, 0xd0, 0x2d, 0x6b, 0x0c, 0x1f, 0x52, 0x53, 0x13, 0x00, 0x08,
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0x13, 0x02, 0x13, 0x03, 0x13, 0x01, 0x00, 0xff, 0x01, 0x00, 0x00, 0x91, 0x00, 0x00, 0x00, 0x0c,
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0x00, 0x0a, 0x00, 0x00, 0x07, 0x64, 0x6f, 0x67, 0x66, 0x69, 0x73, 0x68, 0x00, 0x0b, 0x00, 0x04,
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0x03, 0x00, 0x01, 0x02, 0x00, 0x0a, 0x00, 0x0c, 0x00, 0x0a, 0x00, 0x1d, 0x00, 0x17, 0x00, 0x1e,
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0x00, 0x19, 0x00, 0x18, 0x00, 0x23, 0x00, 0x00, 0x00, 0x16, 0x00, 0x00, 0x00, 0x17, 0x00, 0x00,
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0x00, 0x0d, 0x00, 0x1e, 0x00, 0x1c, 0x04, 0x03, 0x05, 0x03, 0x06, 0x03, 0x08, 0x07, 0x08, 0x08,
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0x08, 0x09, 0x08, 0x0a, 0x08, 0x0b, 0x08, 0x04, 0x08, 0x05, 0x08, 0x06, 0x04, 0x01, 0x05, 0x01,
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0x06, 0x01, 0x00, 0x2b, 0x00, 0x07, 0x06, 0x7f, 0x1c, 0x7f, 0x1b, 0x7f, 0x1a, 0x00, 0x2d, 0x00,
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0x02, 0x01, 0x01, 0x00, 0x33, 0x00, 0x26, 0x00, 0x24, 0x00, 0x1d, 0x00, 0x20, 0x2f, 0x35, 0x0c,
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0xb6, 0x90, 0x0a, 0xb7, 0xd5, 0xc4, 0x1b, 0x2f, 0x60, 0xaa, 0x56, 0x7b, 0x3f, 0x71, 0xc8, 0x01,
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0x7e, 0x86, 0xd3, 0xb7, 0x0c, 0x29, 0x1a, 0x9e, 0x5b, 0x38, 0x3f, 0x01, 0x72,
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},
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domain: "dogfish",
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err: false,
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},
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{
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input: []byte{
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0x16, 0x03, 0x01, 0x01, 0x03, 0x01, 0x00, 0x00,
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0xff, 0x03, 0x03, 0x3d, 0x89, 0x52, 0x9e, 0xee,
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||||||
|
0xbe, 0x17, 0x63, 0x75, 0xef, 0x29, 0xbd, 0x14,
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0x6a, 0x49, 0xe0, 0x2c, 0x37, 0x57, 0x71, 0x62,
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0x82, 0x44, 0x94, 0x8f, 0x6e, 0x94, 0x08, 0x45,
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0x7f, 0xdb, 0xc1, 0x00, 0x00, 0x3e, 0xc0, 0x2c,
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0xc0, 0x30, 0x00, 0x9f, 0xcc, 0xa9, 0xcc, 0xa8,
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0xcc, 0xaa, 0xc0, 0x2b, 0xc0, 0x2f, 0x00, 0x9e,
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0xc0, 0x24, 0xc0, 0x28, 0x00, 0x6b, 0xc0, 0x23,
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|
0xc0, 0x27, 0x00, 0x67, 0xc0, 0x0a, 0xc0, 0x14,
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|
0x00, 0x39, 0xc0, 0x09, 0xc0, 0x13, 0x00, 0x33,
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|
0x00, 0x9d, 0x00, 0x9c, 0x13, 0x02, 0x13, 0x03,
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|
0x13, 0x01, 0x00, 0x3d, 0x00, 0x3c, 0x00, 0x35,
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0x00, 0x2f, 0x00, 0xff, 0x01, 0x00, 0x00, 0x98,
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|
0x00, 0x00, 0x00, 0x10, 0x00, 0x0e, 0x00, 0x00,
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|
0x0b, 0x31, 0x30, 0x2e, 0x34, 0x32, 0x2e, 0x30,
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|
0x2e, 0x32, 0x34, 0x33, 0x00, 0x0b, 0x00, 0x04,
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|
0x03, 0x00, 0x01, 0x02, 0x00, 0x0a, 0x00, 0x0a,
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||||||
|
0x00, 0x08, 0x00, 0x1d, 0x00, 0x17, 0x00, 0x19,
|
||||||
|
0x00, 0x18, 0x00, 0x23, 0x00, 0x00, 0x00, 0x0d,
|
||||||
|
0x00, 0x20, 0x00, 0x1e, 0x04, 0x03, 0x05, 0x03,
|
||||||
|
0x06, 0x03, 0x08, 0x04, 0x08, 0x05, 0x08, 0x06,
|
||||||
|
0x04, 0x01, 0x05, 0x01, 0x06, 0x01, 0x02, 0x03,
|
||||||
|
0x02, 0x01, 0x02, 0x02, 0x04, 0x02, 0x05, 0x02,
|
||||||
|
0x06, 0x02, 0x00, 0x16, 0x00, 0x00, 0x00, 0x17,
|
||||||
|
0x00, 0x00, 0x00, 0x2b, 0x00, 0x09, 0x08, 0x7f,
|
||||||
|
0x14, 0x03, 0x03, 0x03, 0x02, 0x03, 0x01, 0x00,
|
||||||
|
0x2d, 0x00, 0x03, 0x02, 0x01, 0x00, 0x00, 0x28,
|
||||||
|
0x00, 0x26, 0x00, 0x24, 0x00, 0x1d, 0x00, 0x20,
|
||||||
|
0x13, 0x7c, 0x6e, 0x97, 0xc4, 0xfd, 0x09, 0x2e,
|
||||||
|
0x70, 0x2f, 0x73, 0x5a, 0x9b, 0x57, 0x4d, 0x5f,
|
||||||
|
0x2b, 0x73, 0x2c, 0xa5, 0x4a, 0x98, 0x40, 0x3d,
|
||||||
|
0x75, 0x6e, 0xb4, 0x76, 0xf9, 0x48, 0x8f, 0x36,
|
||||||
|
},
|
||||||
|
domain: "10.42.0.243",
|
||||||
|
err: false,
|
||||||
|
},
|
||||||
|
}
|
||||||
|
|
||||||
|
for _, test := range cases {
|
||||||
|
header, err := SniffTLS(test.input)
|
||||||
|
if test.err {
|
||||||
|
if err == nil {
|
||||||
|
t.Errorf("Exepct error but nil in test %v", test)
|
||||||
|
}
|
||||||
|
} else {
|
||||||
|
if err != nil {
|
||||||
|
t.Errorf("Expect no error but actually %s in test %v", err.Error(), test)
|
||||||
|
}
|
||||||
|
if header.Domain() != test.domain {
|
||||||
|
t.Error("expect domain ", test.domain, " but got ", header.Domain())
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
@ -14,6 +14,7 @@ type Enhancer interface {
|
||||||
IsExistFakeIP(net.IP) bool
|
IsExistFakeIP(net.IP) bool
|
||||||
FindHostByIP(net.IP) (string, bool)
|
FindHostByIP(net.IP) (string, bool)
|
||||||
FlushFakeIP() error
|
FlushFakeIP() error
|
||||||
|
InsertHostByIP(net.IP, string)
|
||||||
}
|
}
|
||||||
|
|
||||||
func FakeIPEnabled() bool {
|
func FakeIPEnabled() bool {
|
||||||
|
|
@ -56,6 +57,12 @@ func IsExistFakeIP(ip net.IP) bool {
|
||||||
return false
|
return false
|
||||||
}
|
}
|
||||||
|
|
||||||
|
func InsertHostByIP(ip net.IP, host string) {
|
||||||
|
if mapper := DefaultHostMapper; mapper != nil {
|
||||||
|
mapper.InsertHostByIP(ip, host)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
func FindHostByIP(ip net.IP) (string, bool) {
|
func FindHostByIP(ip net.IP) (string, bool) {
|
||||||
if mapper := DefaultHostMapper; mapper != nil {
|
if mapper := DefaultHostMapper; mapper != nil {
|
||||||
return mapper.FindHostByIP(ip)
|
return mapper.FindHostByIP(ip)
|
||||||
|
|
|
||||||
|
|
@ -74,6 +74,12 @@ func (h *ResolverEnhancer) FindHostByIP(ip net.IP) (string, bool) {
|
||||||
return "", false
|
return "", false
|
||||||
}
|
}
|
||||||
|
|
||||||
|
func (h *ResolverEnhancer) InsertHostByIP(ip net.IP, host string) {
|
||||||
|
if mapping := h.mapping; mapping != nil {
|
||||||
|
h.mapping.Set(ip.String(), host)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
func (h *ResolverEnhancer) PatchFrom(o *ResolverEnhancer) {
|
func (h *ResolverEnhancer) PatchFrom(o *ResolverEnhancer) {
|
||||||
if h.mapping != nil && o.mapping != nil {
|
if h.mapping != nil && o.mapping != nil {
|
||||||
o.mapping.CloneTo(h.mapping)
|
o.mapping.CloneTo(h.mapping)
|
||||||
|
|
|
||||||
|
|
@ -1,10 +1,14 @@
|
||||||
package statistic
|
package statistic
|
||||||
|
|
||||||
import (
|
import (
|
||||||
|
"errors"
|
||||||
"net"
|
"net"
|
||||||
"time"
|
"time"
|
||||||
|
|
||||||
|
"github.com/Dreamacro/clash/common/snifer/tls"
|
||||||
|
"github.com/Dreamacro/clash/component/resolver"
|
||||||
C "github.com/Dreamacro/clash/constant"
|
C "github.com/Dreamacro/clash/constant"
|
||||||
|
"github.com/Dreamacro/clash/log"
|
||||||
|
|
||||||
"github.com/gofrs/uuid"
|
"github.com/gofrs/uuid"
|
||||||
"go.uber.org/atomic"
|
"go.uber.org/atomic"
|
||||||
|
|
@ -48,7 +52,20 @@ func (tt *tcpTracker) Write(b []byte) (int, error) {
|
||||||
n, err := tt.Conn.Write(b)
|
n, err := tt.Conn.Write(b)
|
||||||
upload := int64(n)
|
upload := int64(n)
|
||||||
tt.manager.PushUploaded(upload)
|
tt.manager.PushUploaded(upload)
|
||||||
|
if tt.UploadTotal.Load() < 128 && tt.Metadata.Host == "" && (tt.Metadata.DstPort == "443" || tt.Metadata.DstPort == "8443") {
|
||||||
|
header, err := tls.SniffTLS(b)
|
||||||
|
if err != nil {
|
||||||
|
// log.Errorln("Expect no error but actually %s %s:%s:%s", err.Error(), tt.Metadata.Host, tt.Metadata.DstIP.String(), tt.Metadata.DstPort)
|
||||||
|
} else {
|
||||||
|
resolver.InsertHostByIP(tt.Metadata.DstIP, header.Domain())
|
||||||
|
log.Warnln("use sni update host: %s ip: %s", header.Domain(), tt.Metadata.DstIP.String())
|
||||||
|
tt.manager.Leave(tt)
|
||||||
|
tt.Conn.Close()
|
||||||
|
return n, errors.New("sni update, break current link to avoid leaks")
|
||||||
|
}
|
||||||
|
}
|
||||||
tt.UploadTotal.Add(upload)
|
tt.UploadTotal.Add(upload)
|
||||||
|
|
||||||
return n, err
|
return n, err
|
||||||
}
|
}
|
||||||
|
|
||||||
|
|
|
||||||
Loading…
Reference in a new issue