99 lines
3.2 KiB
Go
99 lines
3.2 KiB
Go
package d4tls
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import (
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"bytes"
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"crypto/sha256"
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"crypto/x509"
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"fmt"
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"time"
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"github.com/D4-project/sensor-d4-tls-fingerprinting/etls"
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)
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type certMapElm struct {
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CertHash string
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*x509.Certificate
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}
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type sessionRecord struct {
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ServerIP string
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ServerPort string
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ClientIP string
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ClientPort string
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TLSH string
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Timestamp time.Time
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JA3 string
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JA3Digest string
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JA3S string
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JA3SDigest string
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Certificates []certMapElm
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}
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// TLSSession contains a handshakeRecord that had to be filled during the handshake,
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// and a Record that will be at last exported to Json
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type TLSSession struct {
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Record sessionRecord
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handShakeRecord etls.ETLSHandshakeRecord
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stage int
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}
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// String returns a string that describes a TLSSession
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func (t *TLSSession) String() string {
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var buf bytes.Buffer
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buf.WriteString(fmt.Sprintf("---------------SESSION START-------------------\n"))
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buf.WriteString(fmt.Sprintf("Time: %v\n", t.Record.Timestamp))
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buf.WriteString(fmt.Sprintf("Client: %v:%v\n", t.Record.ClientIP, t.Record.ClientPort))
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buf.WriteString(fmt.Sprintf("Server: %v:%v\n", t.Record.ServerIP, t.Record.ServerPort))
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buf.WriteString(fmt.Sprintf("TLSH: %q\n", t.Record.TLSH))
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buf.WriteString(fmt.Sprintf("ja3: %q\n", t.Record.JA3))
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buf.WriteString(fmt.Sprintf("ja3 Digest: %q\n", t.Record.JA3Digest))
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buf.WriteString(fmt.Sprintf("ja3s: %q\n", t.Record.JA3S))
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buf.WriteString(fmt.Sprintf("ja3s Digest: %q\n", t.Record.JA3SDigest))
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for _, certMe := range t.Record.Certificates {
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buf.WriteString(fmt.Sprintf("Certificate Issuer: %q\n", certMe.Certificate.Issuer))
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buf.WriteString(fmt.Sprintf("Certificate Subject: %q\n", certMe.Certificate.Subject))
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buf.WriteString(fmt.Sprintf("Certificate is CA: %t\n", certMe.Certificate.IsCA))
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buf.WriteString(fmt.Sprintf("Certificate SHA256: %q\n", certMe.CertHash))
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}
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buf.WriteString(fmt.Sprintf("---------------SESSION END--------------------\n"))
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return buf.String()
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}
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// PopulateClientHello takes a pointer to an etls ClientHelloMsg and writes it to the the TLSSession struct
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func (t *TLSSession) PopulateClientHello(h *etls.ClientHelloMsg, cip string, sip string, cp string, sp string, ti time.Time) {
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if t.stage < 1 {
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t.Record.ClientIP = cip
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t.Record.ServerIP = sip
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t.Record.ClientPort = cp
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t.Record.ServerPort = sp
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t.Record.Timestamp = ti
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t.handShakeRecord.ETLSHandshakeClientHello = h
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t.stage = 1
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}
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}
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// PopulateServerHello takes a pointer to an etls ServerHelloMsg and writes it to the TLSSession struct
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func (t *TLSSession) PopulateServerHello(h *etls.ServerHelloMsg) {
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if t.stage < 2 {
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t.handShakeRecord.ETLSHandshakeServerHello = h
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t.stage = 2
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}
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}
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// PopulateCertificate takes a pointer to an etls ServerHelloMsg and writes it to the TLSSession struct
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func (t *TLSSession) PopulateCertificate(c *etls.CertificateMsg) {
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if t.stage < 3 {
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t.handShakeRecord.ETLSHandshakeCertificate = c
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for _, asn1Data := range t.handShakeRecord.ETLSHandshakeCertificate.Certificates {
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cert, err := x509.ParseCertificate(asn1Data)
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if err != nil {
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//return err
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} else {
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h := sha256.New()
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h.Write(cert.Raw)
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t.Record.Certificates = append(t.Record.Certificates, certMapElm{Certificate: cert, CertHash: fmt.Sprintf("%x", h.Sum(nil))})
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}
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}
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}
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}
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