149 lines
4.1 KiB
Go
149 lines
4.1 KiB
Go
package d4tls
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import (
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"crypto/md5"
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"encoding/hex"
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"fmt"
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"strconv"
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"strings"
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"github.com/glaslos/tlsh"
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)
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// see https://tools.ietf.org/html/draft-ietf-tls-grease-02
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// grease values for cipher suites, ALPN and identifiers,
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// extensions, named groups, signatur algorithms, and versions.
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var grease = map[uint16]bool{
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0x0a0a: true, 0x1a1a: true, 0x2a2a: true, 0x3a3a: true,
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0x4a4a: true, 0x5a5a: true, 0x6a6a: true, 0x7a7a: true,
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0x8a8a: true, 0x9a9a: true, 0xaaaa: true, 0xbaba: true,
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0xcaca: true, 0xdada: true, 0xeaea: true, 0xfafa: true,
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}
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// D4Fingerprinting computes fingerprints
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func (t *TLSSession) D4Fingerprinting(fd string) bool {
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switch fd {
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case "ja3":
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t.ja3()
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case "ja3s":
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t.ja3s()
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case "tlsh":
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t.d4fg()
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default:
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return false
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}
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return true
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}
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func (t *TLSSession) d4fg() string {
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buf := t.Record.JA3 + t.Record.JA3S
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for _, cert := range t.Record.Certificates {
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buf += fmt.Sprintf("%q", cert.Issuer) + fmt.Sprintf("%q", cert.Subject)
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}
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buf = strings.Replace(buf, "-", "", -1)
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buf = strings.Replace(buf, ",", "", -1)
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buf = strings.Replace(buf, "\"", "", -1)
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out, _ := tlsh.HashBytes([]byte(buf))
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t.Record.TLSH = out.String()
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return buf
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}
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func (t *TLSSession) ja3s() bool {
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var buf []byte
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buf = strconv.AppendInt(buf, int64(t.handShakeRecord.ETLSHandshakeServerHello.Vers), 10)
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// byte (44) is ","
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buf = append(buf, byte(44))
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// If the Server Cipher is not in GREASE
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if grease[uint16(t.handShakeRecord.ETLSHandshakeServerHello.CipherSuite)] == false {
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buf = strconv.AppendInt(buf, int64(t.handShakeRecord.ETLSHandshakeServerHello.CipherSuite), 10)
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}
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buf = append(buf, byte(44))
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// If there are extensions
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if len(t.handShakeRecord.ETLSHandshakeServerHello.AllExtensions) > 0 {
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for i, e := range t.handShakeRecord.ETLSHandshakeServerHello.AllExtensions {
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if grease[uint16(e)] == false {
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buf = strconv.AppendInt(buf, int64(e), 10)
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if (i + 1) < len(t.handShakeRecord.ETLSHandshakeServerHello.AllExtensions) {
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// byte(45) is "-"
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buf = append(buf, byte(45))
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}
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}
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}
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}
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t.Record.JA3S = string(buf)
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tmp := md5.Sum(buf)
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t.Record.JA3SDigest = hex.EncodeToString(tmp[:])
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return true
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}
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func (t *TLSSession) ja3() bool {
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var buf []byte
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buf = strconv.AppendInt(buf, int64(t.handShakeRecord.ETLSHandshakeClientHello.Vers), 10)
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// byte (44) is ","
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buf = append(buf, byte(44))
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// If there are Cipher Suites
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if len(t.handShakeRecord.ETLSHandshakeClientHello.CipherSuites) > 0 {
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for i, cs := range t.handShakeRecord.ETLSHandshakeClientHello.CipherSuites {
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if grease[uint16(cs)] == false {
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buf = strconv.AppendInt(buf, int64(cs), 10)
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// byte(45) is "-"
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if (i + 1) < len(t.handShakeRecord.ETLSHandshakeClientHello.CipherSuites) {
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buf = append(buf, byte(45))
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}
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}
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}
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}
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buf = append(buf, byte(44))
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// If there are extensions
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if len(t.handShakeRecord.ETLSHandshakeClientHello.AllExtensions) > 0 {
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for i, e := range t.handShakeRecord.ETLSHandshakeClientHello.AllExtensions {
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if grease[uint16(e)] == false {
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buf = strconv.AppendInt(buf, int64(e), 10)
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if (i + 1) < len(t.handShakeRecord.ETLSHandshakeClientHello.AllExtensions) {
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buf = append(buf, byte(45))
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}
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}
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}
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}
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buf = append(buf, byte(44))
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// If there are Supported Curves
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if len(t.handShakeRecord.ETLSHandshakeClientHello.SupportedCurves) > 0 {
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for i, cs := range t.handShakeRecord.ETLSHandshakeClientHello.SupportedCurves {
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if grease[uint16(cs)] == false {
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buf = strconv.AppendInt(buf, int64(cs), 10)
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if (i + 1) < len(t.handShakeRecord.ETLSHandshakeClientHello.SupportedCurves) {
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buf = append(buf, byte(45))
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}
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}
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}
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}
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buf = append(buf, byte(44))
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// If there are Supported Points
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if len(t.handShakeRecord.ETLSHandshakeClientHello.SupportedPoints) > 0 {
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for i, cs := range t.handShakeRecord.ETLSHandshakeClientHello.SupportedPoints {
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if grease[uint16(cs)] == false {
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buf = strconv.AppendInt(buf, int64(cs), 10)
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if (i + 1) < len(t.handShakeRecord.ETLSHandshakeClientHello.SupportedPoints) {
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buf = append(buf, byte(45))
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}
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}
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}
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}
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t.Record.JA3 = string(buf)
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tmp := md5.Sum(buf)
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t.Record.JA3Digest = hex.EncodeToString(tmp[:])
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return true
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}
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