-
Notifications
You must be signed in to change notification settings - Fork 5
/
authority.go
113 lines (97 loc) · 2.86 KB
/
authority.go
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
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
package tlsconfig
import (
"crypto/x509"
"encoding/pem"
"fmt"
"os"
)
// PoolOption is an functional option type that can be used to configure a
// certificate pool.
type PoolOption func(*x509.CertPool) error
// PoolBuilder is used to build a certificate pool. You normally won't need to
// Build this yourself and instead should use the WithAuthorityBuilder and
// WithClientAuthenticationBuilder functions.
type PoolBuilder struct {
base *x509.CertPool
opts []PoolOption
err error
}
// Build creates the certificate pool.
func (pb PoolBuilder) Build() (*x509.CertPool, error) {
if pb.err != nil {
return nil, pb.err
}
for _, opt := range pb.opts {
if err := opt(pb.base); err != nil {
return nil, err
}
}
return pb.base, nil
}
// FromEmptyPool creates a PoolBuilder from an empty certificate pool. The
// options passed can amend the returned pool.
func FromEmptyPool(opts ...PoolOption) PoolBuilder {
return PoolBuilder{
base: x509.NewCertPool(),
opts: opts,
}
}
// FromSystemPool creates a PoolBuilder from the system's certificate pool. The
// options passed can amend the returned pool.
func FromSystemPool(opts ...PoolOption) PoolBuilder {
pool, err := x509.SystemCertPool()
return PoolBuilder{
base: pool,
err: err,
opts: opts,
}
}
// WithCertsFromFile will add all of the certificates found in a PEM-encoded
// file to a certificate pool.
func WithCertsFromFile(path string) PoolOption {
return func(pool *x509.CertPool) error {
pemCerts, err := os.ReadFile(path)
if err != nil {
return fmt.Errorf("failed to read certificate(s) at path %q: %s", path, err)
}
certsRead := 0
for len(pemCerts) > 0 {
var block *pem.Block
block, pemCerts = pem.Decode(pemCerts)
if block == nil {
break
}
if len(block.Headers) != 0 {
return fmt.Errorf("unexpected headers in PEM block in file %q: %v", path, block.Headers)
}
if block.Type != "CERTIFICATE" {
return fmt.Errorf("unexpected PEM block type %q in file %q", block.Type, path)
}
cert, err := x509.ParseCertificate(block.Bytes)
if err != nil {
return fmt.Errorf("failed to parse certificate in %q: %s", path, err)
}
if err := WithCert(cert)(pool); err != nil {
return fmt.Errorf("failed to add certificate in file %q to pool: %s", path, err)
}
certsRead++
}
if certsRead == 0 {
return fmt.Errorf("no valid certificates read from file %q", path)
}
return nil
}
}
// WithCert will add the certificate directly to a certificate pool.
func WithCert(cert *x509.Certificate) PoolOption {
return func(pool *x509.CertPool) error {
// We do not check if the certificate is valid here in case that a user
// has an expired root certificate that they never use in their system
// certificate store.
//
// Perhaps we can only check the expiration in the case the that
// certificate is user specified?
pool.AddCert(cert)
return nil
}
}