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# Conflicts: # tunnel/statistic/tracker.go # tunnel/tunnel.go
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,148 @@ | ||
package tls | ||
|
||
import ( | ||
"encoding/binary" | ||
"errors" | ||
"strings" | ||
) | ||
|
||
var ErrNoClue = errors.New("not enough information for making a decision") | ||
|
||
type SniffHeader struct { | ||
domain string | ||
} | ||
|
||
func (h *SniffHeader) Protocol() string { | ||
return "tls" | ||
} | ||
|
||
func (h *SniffHeader) Domain() string { | ||
return h.domain | ||
} | ||
|
||
var ( | ||
errNotTLS = errors.New("not TLS header") | ||
errNotClientHello = errors.New("not client hello") | ||
) | ||
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||
func IsValidTLSVersion(major, minor byte) bool { | ||
return major == 3 | ||
} | ||
|
||
// ReadClientHello returns server name (if any) from TLS client hello message. | ||
// https://github.com/golang/go/blob/master/src/crypto/tls/handshake_messages.go#L300 | ||
func ReadClientHello(data []byte, h *SniffHeader) error { | ||
if len(data) < 42 { | ||
return ErrNoClue | ||
} | ||
sessionIDLen := int(data[38]) | ||
if sessionIDLen > 32 || len(data) < 39+sessionIDLen { | ||
return ErrNoClue | ||
} | ||
data = data[39+sessionIDLen:] | ||
if len(data) < 2 { | ||
return ErrNoClue | ||
} | ||
// cipherSuiteLen is the number of bytes of cipher suite numbers. Since | ||
// they are uint16s, the number must be even. | ||
cipherSuiteLen := int(data[0])<<8 | int(data[1]) | ||
if cipherSuiteLen%2 == 1 || len(data) < 2+cipherSuiteLen { | ||
return errNotClientHello | ||
} | ||
data = data[2+cipherSuiteLen:] | ||
if len(data) < 1 { | ||
return ErrNoClue | ||
} | ||
compressionMethodsLen := int(data[0]) | ||
if len(data) < 1+compressionMethodsLen { | ||
return ErrNoClue | ||
} | ||
data = data[1+compressionMethodsLen:] | ||
|
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if len(data) == 0 { | ||
return errNotClientHello | ||
} | ||
if len(data) < 2 { | ||
return errNotClientHello | ||
} | ||
|
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extensionsLength := int(data[0])<<8 | int(data[1]) | ||
data = data[2:] | ||
if extensionsLength != len(data) { | ||
return errNotClientHello | ||
} | ||
|
||
for len(data) != 0 { | ||
if len(data) < 4 { | ||
return errNotClientHello | ||
} | ||
extension := uint16(data[0])<<8 | uint16(data[1]) | ||
length := int(data[2])<<8 | int(data[3]) | ||
data = data[4:] | ||
if len(data) < length { | ||
return errNotClientHello | ||
} | ||
|
||
if extension == 0x00 { /* extensionServerName */ | ||
d := data[:length] | ||
if len(d) < 2 { | ||
return errNotClientHello | ||
} | ||
namesLen := int(d[0])<<8 | int(d[1]) | ||
d = d[2:] | ||
if len(d) != namesLen { | ||
return errNotClientHello | ||
} | ||
for len(d) > 0 { | ||
if len(d) < 3 { | ||
return errNotClientHello | ||
} | ||
nameType := d[0] | ||
nameLen := int(d[1])<<8 | int(d[2]) | ||
d = d[3:] | ||
if len(d) < nameLen { | ||
return errNotClientHello | ||
} | ||
if nameType == 0 { | ||
serverName := string(d[:nameLen]) | ||
// An SNI value may not include a | ||
// trailing dot. See | ||
// https://tools.ietf.org/html/rfc6066#section-3. | ||
if strings.HasSuffix(serverName, ".") { | ||
return errNotClientHello | ||
} | ||
h.domain = serverName | ||
return nil | ||
} | ||
d = d[nameLen:] | ||
} | ||
} | ||
data = data[length:] | ||
} | ||
|
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return errNotTLS | ||
} | ||
|
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func SniffTLS(b []byte) (*SniffHeader, error) { | ||
if len(b) < 5 { | ||
return nil, ErrNoClue | ||
} | ||
|
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if b[0] != 0x16 /* TLS Handshake */ { | ||
return nil, errNotTLS | ||
} | ||
if !IsValidTLSVersion(b[1], b[2]) { | ||
return nil, errNotTLS | ||
} | ||
headerLen := int(binary.BigEndian.Uint16(b[3:5])) | ||
if 5+headerLen > len(b) { | ||
return nil, ErrNoClue | ||
} | ||
|
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h := &SniffHeader{} | ||
err := ReadClientHello(b[5:5+headerLen], h) | ||
if err == nil { | ||
return h, nil | ||
} | ||
return nil, err | ||
} |
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,159 @@ | ||
package tls | ||
|
||
import ( | ||
"testing" | ||
) | ||
|
||
func TestTLSHeaders(t *testing.T) { | ||
cases := []struct { | ||
input []byte | ||
domain string | ||
err bool | ||
}{ | ||
{ | ||
input: []byte{ | ||
0x16, 0x03, 0x01, 0x00, 0xc8, 0x01, 0x00, 0x00, | ||
0xc4, 0x03, 0x03, 0x1a, 0xac, 0xb2, 0xa8, 0xfe, | ||
0xb4, 0x96, 0x04, 0x5b, 0xca, 0xf7, 0xc1, 0xf4, | ||
0x2e, 0x53, 0x24, 0x6e, 0x34, 0x0c, 0x58, 0x36, | ||
0x71, 0x97, 0x59, 0xe9, 0x41, 0x66, 0xe2, 0x43, | ||
0xa0, 0x13, 0xb6, 0x00, 0x00, 0x20, 0x1a, 0x1a, | ||
0xc0, 0x2b, 0xc0, 0x2f, 0xc0, 0x2c, 0xc0, 0x30, | ||
0xcc, 0xa9, 0xcc, 0xa8, 0xcc, 0x14, 0xcc, 0x13, | ||
0xc0, 0x13, 0xc0, 0x14, 0x00, 0x9c, 0x00, 0x9d, | ||
0x00, 0x2f, 0x00, 0x35, 0x00, 0x0a, 0x01, 0x00, | ||
0x00, 0x7b, 0xba, 0xba, 0x00, 0x00, 0xff, 0x01, | ||
0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x16, 0x00, | ||
0x14, 0x00, 0x00, 0x11, 0x63, 0x2e, 0x73, 0x2d, | ||
0x6d, 0x69, 0x63, 0x72, 0x6f, 0x73, 0x6f, 0x66, | ||
0x74, 0x2e, 0x63, 0x6f, 0x6d, 0x00, 0x17, 0x00, | ||
0x00, 0x00, 0x23, 0x00, 0x00, 0x00, 0x0d, 0x00, | ||
0x14, 0x00, 0x12, 0x04, 0x03, 0x08, 0x04, 0x04, | ||
0x01, 0x05, 0x03, 0x08, 0x05, 0x05, 0x01, 0x08, | ||
0x06, 0x06, 0x01, 0x02, 0x01, 0x00, 0x05, 0x00, | ||
0x05, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x12, | ||
0x00, 0x00, 0x00, 0x10, 0x00, 0x0e, 0x00, 0x0c, | ||
0x02, 0x68, 0x32, 0x08, 0x68, 0x74, 0x74, 0x70, | ||
0x2f, 0x31, 0x2e, 0x31, 0x00, 0x0b, 0x00, 0x02, | ||
0x01, 0x00, 0x00, 0x0a, 0x00, 0x0a, 0x00, 0x08, | ||
0xaa, 0xaa, 0x00, 0x1d, 0x00, 0x17, 0x00, 0x18, | ||
0xaa, 0xaa, 0x00, 0x01, 0x00, | ||
}, | ||
domain: "c.s-microsoft.com", | ||
err: false, | ||
}, | ||
{ | ||
input: []byte{ | ||
0x16, 0x03, 0x01, 0x00, 0xee, 0x01, 0x00, 0x00, | ||
0xea, 0x03, 0x03, 0xe7, 0x91, 0x9e, 0x93, 0xca, | ||
0x78, 0x1b, 0x3c, 0xe0, 0x65, 0x25, 0x58, 0xb5, | ||
0x93, 0xe1, 0x0f, 0x85, 0xec, 0x9a, 0x66, 0x8e, | ||
0x61, 0x82, 0x88, 0xc8, 0xfc, 0xae, 0x1e, 0xca, | ||
0xd7, 0xa5, 0x63, 0x20, 0xbd, 0x1c, 0x00, 0x00, | ||
0x8b, 0xee, 0x09, 0xe3, 0x47, 0x6a, 0x0e, 0x74, | ||
0xb0, 0xbc, 0xa3, 0x02, 0xa7, 0x35, 0xe8, 0x85, | ||
0x70, 0x7c, 0x7a, 0xf0, 0x00, 0xdf, 0x4a, 0xea, | ||
0x87, 0x01, 0x14, 0x91, 0x00, 0x20, 0xea, 0xea, | ||
0xc0, 0x2b, 0xc0, 0x2f, 0xc0, 0x2c, 0xc0, 0x30, | ||
0xcc, 0xa9, 0xcc, 0xa8, 0xcc, 0x14, 0xcc, 0x13, | ||
0xc0, 0x13, 0xc0, 0x14, 0x00, 0x9c, 0x00, 0x9d, | ||
0x00, 0x2f, 0x00, 0x35, 0x00, 0x0a, 0x01, 0x00, | ||
0x00, 0x81, 0x9a, 0x9a, 0x00, 0x00, 0xff, 0x01, | ||
0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x18, 0x00, | ||
0x16, 0x00, 0x00, 0x13, 0x77, 0x77, 0x77, 0x30, | ||
0x37, 0x2e, 0x63, 0x6c, 0x69, 0x63, 0x6b, 0x74, | ||
0x61, 0x6c, 0x65, 0x2e, 0x6e, 0x65, 0x74, 0x00, | ||
0x17, 0x00, 0x00, 0x00, 0x23, 0x00, 0x00, 0x00, | ||
0x0d, 0x00, 0x14, 0x00, 0x12, 0x04, 0x03, 0x08, | ||
0x04, 0x04, 0x01, 0x05, 0x03, 0x08, 0x05, 0x05, | ||
0x01, 0x08, 0x06, 0x06, 0x01, 0x02, 0x01, 0x00, | ||
0x05, 0x00, 0x05, 0x01, 0x00, 0x00, 0x00, 0x00, | ||
0x00, 0x12, 0x00, 0x00, 0x00, 0x10, 0x00, 0x0e, | ||
0x00, 0x0c, 0x02, 0x68, 0x32, 0x08, 0x68, 0x74, | ||
0x74, 0x70, 0x2f, 0x31, 0x2e, 0x31, 0x75, 0x50, | ||
0x00, 0x00, 0x00, 0x0b, 0x00, 0x02, 0x01, 0x00, | ||
0x00, 0x0a, 0x00, 0x0a, 0x00, 0x08, 0x9a, 0x9a, | ||
0x00, 0x1d, 0x00, 0x17, 0x00, 0x18, 0x8a, 0x8a, | ||
0x00, 0x01, 0x00, | ||
}, | ||
domain: "www07.clicktale.net", | ||
err: false, | ||
}, | ||
{ | ||
input: []byte{ | ||
0x16, 0x03, 0x01, 0x00, 0xe6, 0x01, 0x00, 0x00, 0xe2, 0x03, 0x03, 0x81, 0x47, 0xc1, | ||
0x66, 0xd5, 0x1b, 0xfa, 0x4b, 0xb5, 0xe0, 0x2a, 0xe1, 0xa7, 0x87, 0x13, 0x1d, 0x11, 0xaa, 0xc6, | ||
0xce, 0xfc, 0x7f, 0xab, 0x94, 0xc8, 0x62, 0xad, 0xc8, 0xab, 0x0c, 0xdd, 0xcb, 0x20, 0x6f, 0x9d, | ||
0x07, 0xf1, 0x95, 0x3e, 0x99, 0xd8, 0xf3, 0x6d, 0x97, 0xee, 0x19, 0x0b, 0x06, 0x1b, 0xf4, 0x84, | ||
0x0b, 0xb6, 0x8f, 0xcc, 0xde, 0xe2, 0xd0, 0x2d, 0x6b, 0x0c, 0x1f, 0x52, 0x53, 0x13, 0x00, 0x08, | ||
0x13, 0x02, 0x13, 0x03, 0x13, 0x01, 0x00, 0xff, 0x01, 0x00, 0x00, 0x91, 0x00, 0x00, 0x00, 0x0c, | ||
0x00, 0x0a, 0x00, 0x00, 0x07, 0x64, 0x6f, 0x67, 0x66, 0x69, 0x73, 0x68, 0x00, 0x0b, 0x00, 0x04, | ||
0x03, 0x00, 0x01, 0x02, 0x00, 0x0a, 0x00, 0x0c, 0x00, 0x0a, 0x00, 0x1d, 0x00, 0x17, 0x00, 0x1e, | ||
0x00, 0x19, 0x00, 0x18, 0x00, 0x23, 0x00, 0x00, 0x00, 0x16, 0x00, 0x00, 0x00, 0x17, 0x00, 0x00, | ||
0x00, 0x0d, 0x00, 0x1e, 0x00, 0x1c, 0x04, 0x03, 0x05, 0x03, 0x06, 0x03, 0x08, 0x07, 0x08, 0x08, | ||
0x08, 0x09, 0x08, 0x0a, 0x08, 0x0b, 0x08, 0x04, 0x08, 0x05, 0x08, 0x06, 0x04, 0x01, 0x05, 0x01, | ||
0x06, 0x01, 0x00, 0x2b, 0x00, 0x07, 0x06, 0x7f, 0x1c, 0x7f, 0x1b, 0x7f, 0x1a, 0x00, 0x2d, 0x00, | ||
0x02, 0x01, 0x01, 0x00, 0x33, 0x00, 0x26, 0x00, 0x24, 0x00, 0x1d, 0x00, 0x20, 0x2f, 0x35, 0x0c, | ||
0xb6, 0x90, 0x0a, 0xb7, 0xd5, 0xc4, 0x1b, 0x2f, 0x60, 0xaa, 0x56, 0x7b, 0x3f, 0x71, 0xc8, 0x01, | ||
0x7e, 0x86, 0xd3, 0xb7, 0x0c, 0x29, 0x1a, 0x9e, 0x5b, 0x38, 0x3f, 0x01, 0x72, | ||
}, | ||
domain: "dogfish", | ||
err: false, | ||
}, | ||
{ | ||
input: []byte{ | ||
0x16, 0x03, 0x01, 0x01, 0x03, 0x01, 0x00, 0x00, | ||
0xff, 0x03, 0x03, 0x3d, 0x89, 0x52, 0x9e, 0xee, | ||
0xbe, 0x17, 0x63, 0x75, 0xef, 0x29, 0xbd, 0x14, | ||
0x6a, 0x49, 0xe0, 0x2c, 0x37, 0x57, 0x71, 0x62, | ||
0x82, 0x44, 0x94, 0x8f, 0x6e, 0x94, 0x08, 0x45, | ||
0x7f, 0xdb, 0xc1, 0x00, 0x00, 0x3e, 0xc0, 0x2c, | ||
0xc0, 0x30, 0x00, 0x9f, 0xcc, 0xa9, 0xcc, 0xa8, | ||
0xcc, 0xaa, 0xc0, 0x2b, 0xc0, 0x2f, 0x00, 0x9e, | ||
0xc0, 0x24, 0xc0, 0x28, 0x00, 0x6b, 0xc0, 0x23, | ||
0xc0, 0x27, 0x00, 0x67, 0xc0, 0x0a, 0xc0, 0x14, | ||
0x00, 0x39, 0xc0, 0x09, 0xc0, 0x13, 0x00, 0x33, | ||
0x00, 0x9d, 0x00, 0x9c, 0x13, 0x02, 0x13, 0x03, | ||
0x13, 0x01, 0x00, 0x3d, 0x00, 0x3c, 0x00, 0x35, | ||
0x00, 0x2f, 0x00, 0xff, 0x01, 0x00, 0x00, 0x98, | ||
0x00, 0x00, 0x00, 0x10, 0x00, 0x0e, 0x00, 0x00, | ||
0x0b, 0x31, 0x30, 0x2e, 0x34, 0x32, 0x2e, 0x30, | ||
0x2e, 0x32, 0x34, 0x33, 0x00, 0x0b, 0x00, 0x04, | ||
0x03, 0x00, 0x01, 0x02, 0x00, 0x0a, 0x00, 0x0a, | ||
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, | ||
}, | ||
} | ||
|
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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()) | ||
} | ||
} | ||
} | ||
} |
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