blob: 22a248e1c5d2face9ac61a3232117c16e3f62bcf (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
|
package main
import (
"crypto/sha256"
"crypto/tls"
"crypto/x509"
"encoding/hex"
"errors"
)
func tlsConfig() *tls.Config {
return &tls.Config{
InsecureSkipVerify: true,
VerifyConnection: tofuVerify,
}
}
var tofuStore map[string]string
var ErrTOFUViolation = errors.New("certificate for this domain has changed")
func tofuVerify(connState tls.ConnectionState) error {
certhash, err := hashCert(connState.PeerCertificates[0])
if err != nil {
return err
}
expected, ok := tofuStore[connState.ServerName]
if !ok {
tofuStore[connState.ServerName] = certhash
return saveTofuStore(tofuStore)
}
if certhash != expected {
return ErrTOFUViolation
}
return nil
}
func hashCert(cert *x509.Certificate) (string, error) {
pubkeybytes, err := x509.MarshalPKIXPublicKey(cert.PublicKey)
if err != nil {
return "", err
}
hash := sha256.Sum256(pubkeybytes)
return hex.EncodeToString(hash[:]), nil
}
|
