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
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
|
package localca
import (
"crypto"
"crypto/ecdsa"
"crypto/rsa"
"crypto/x509"
"errors"
"time"
)
// validCert parses a cert chain provided as der argument and verifies the leaf and der[0]
// correspond to the private key, the domain and key type match, and expiration dates
// are valid. It doesn't do any revocation checking.
//
// The returned value is the verified leaf cert.
func validCert(name string, der [][]byte, key crypto.Signer, now time.Time) (leaf *x509.Certificate, err error) {
// parse public part(s)
var n int
for _, b := range der {
n += len(b)
}
pub := make([]byte, n)
n = 0
for _, b := range der {
n += copy(pub[n:], b)
}
x509Cert, err := x509.ParseCertificates(pub)
if err != nil || len(x509Cert) == 0 {
return nil, errors.New("localca: no public key found")
}
// verify the leaf is not expired and matches the domain name
leaf = x509Cert[0]
if now.Before(leaf.NotBefore) {
return nil, errors.New("localca: certificate is not valid yet")
}
if now.After(leaf.NotAfter) {
return nil, errors.New("localca: expired certificate")
}
if err := leaf.VerifyHostname(name); err != nil {
return nil, err
}
// ensure the leaf corresponds to the private key and matches the certKey type
switch pub := leaf.PublicKey.(type) {
case *rsa.PublicKey:
prv, ok := key.(*rsa.PrivateKey)
if !ok {
return nil, errors.New("localca: private key type does not match public key type")
}
if pub.N.Cmp(prv.N) != 0 {
return nil, errors.New("localca: private key does not match public key")
}
default:
return nil, errors.New("localca: unknown public key algorithm")
}
return leaf, nil
}
// Attempt to parse the given private key DER block. OpenSSL 0.9.8 generates
// PKCS#1 private keys by default, while OpenSSL 1.0.0 generates PKCS#8 keys.
// OpenSSL ecparam generates SEC1 EC private keys for ECDSA. We try all three.
//
// Inspired by parsePrivateKey in crypto/tls/tls.go.
func parsePrivateKey(der []byte) (crypto.Signer, error) {
if key, err := x509.ParsePKCS1PrivateKey(der); err == nil {
return key, nil
}
if key, err := x509.ParsePKCS8PrivateKey(der); err == nil {
switch key := key.(type) {
case *rsa.PrivateKey:
return key, nil
case *ecdsa.PrivateKey:
return key, nil
default:
return nil, errors.New("localca: unknown private key type in PKCS#8 wrapping")
}
}
if key, err := x509.ParseECPrivateKey(der); err == nil {
return key, nil
}
return nil, errors.New("localca: failed to parse private key")
}
|
