mirror of https://github.com/status-im/consul.git
130 lines
3.6 KiB
Go
130 lines
3.6 KiB
Go
// Copyright (c) HashiCorp, Inc.
|
|
// SPDX-License-Identifier: BUSL-1.1
|
|
|
|
package connect
|
|
|
|
import (
|
|
"crypto/x509"
|
|
"crypto/x509/pkix"
|
|
"encoding/asn1"
|
|
"fmt"
|
|
"net"
|
|
"net/url"
|
|
"unicode"
|
|
)
|
|
|
|
// NOTE: the contents of this file were lifted from
|
|
// $GOROOT/src/crypto/x509/x509.go from a Go 1.16.5 checkout.
|
|
//
|
|
//
|
|
// After https://go-review.googlesource.com/c/go/+/329129 lands in a Go release
|
|
// we are compiling against we can safely remove all of this code.
|
|
|
|
var (
|
|
x509_oidExtensionSubjectAltName = []int{2, 5, 29, 17}
|
|
)
|
|
|
|
const (
|
|
x509_nameTypeEmail = 1
|
|
x509_nameTypeDNS = 2
|
|
x509_nameTypeURI = 6
|
|
x509_nameTypeIP = 7
|
|
)
|
|
|
|
// HackSANExtensionForCSR will create a SAN extension on the CSR off of the
|
|
// convenience fields (DNSNames, EmailAddresses, IPAddresses, URIs) and
|
|
// appropriately marks that SAN extension as critical if the CSR has an empty
|
|
// subject.
|
|
//
|
|
// This is basically attempting to repeat this blob of code from the stdlib
|
|
// ourselves:
|
|
//
|
|
// https://github.com/golang/go/blob/0e67ce3d28320e816dd8e7cf7d701c1804fb977e/src/crypto/x509/x509.go#L1088
|
|
func HackSANExtensionForCSR(template *x509.CertificateRequest) {
|
|
switch {
|
|
case len(template.DNSNames) > 0:
|
|
case len(template.EmailAddresses) > 0:
|
|
case len(template.IPAddresses) > 0:
|
|
case len(template.URIs) > 0:
|
|
default:
|
|
return
|
|
}
|
|
|
|
if x509_oidInExtensions(x509_oidExtensionSubjectAltName, template.ExtraExtensions) {
|
|
return
|
|
}
|
|
|
|
value, err := x509_marshalSANs(template.DNSNames, template.EmailAddresses, template.IPAddresses, template.URIs)
|
|
if err != nil {
|
|
return
|
|
}
|
|
|
|
ext := pkix.Extension{
|
|
Id: x509_oidExtensionSubjectAltName,
|
|
// From RFC 5280, Section 4.2.1.6:
|
|
// “If the subject field contains an empty sequence ... then
|
|
// subjectAltName extension ... is marked as critical”
|
|
//
|
|
// Since we just cleared the subject above, it's critical.
|
|
Critical: true,
|
|
Value: value,
|
|
}
|
|
template.ExtraExtensions = append(template.ExtraExtensions, ext)
|
|
}
|
|
|
|
// x509_oidInExtensions reports whether an extension with the given oid exists in
|
|
// extensions.
|
|
func x509_oidInExtensions(oid asn1.ObjectIdentifier, extensions []pkix.Extension) bool {
|
|
for _, e := range extensions {
|
|
if e.Id.Equal(oid) {
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
// x509_marshalSANs marshals a list of addresses into a the contents of an X.509
|
|
// SubjectAlternativeName extension.
|
|
func x509_marshalSANs(dnsNames, emailAddresses []string, ipAddresses []net.IP, uris []*url.URL) (derBytes []byte, err error) {
|
|
var rawValues []asn1.RawValue
|
|
for _, name := range dnsNames {
|
|
if err := x509_isIA5String(name); err != nil {
|
|
return nil, err
|
|
}
|
|
rawValues = append(rawValues, asn1.RawValue{Tag: x509_nameTypeDNS, Class: 2, Bytes: []byte(name)})
|
|
}
|
|
for _, email := range emailAddresses {
|
|
if err := x509_isIA5String(email); err != nil {
|
|
return nil, err
|
|
}
|
|
rawValues = append(rawValues, asn1.RawValue{Tag: x509_nameTypeEmail, Class: 2, Bytes: []byte(email)})
|
|
}
|
|
for _, rawIP := range ipAddresses {
|
|
// If possible, we always want to encode IPv4 addresses in 4 bytes.
|
|
ip := rawIP.To4()
|
|
if ip == nil {
|
|
ip = rawIP
|
|
}
|
|
rawValues = append(rawValues, asn1.RawValue{Tag: x509_nameTypeIP, Class: 2, Bytes: ip})
|
|
}
|
|
for _, uri := range uris {
|
|
uriStr := uri.String()
|
|
if err := x509_isIA5String(uriStr); err != nil {
|
|
return nil, err
|
|
}
|
|
rawValues = append(rawValues, asn1.RawValue{Tag: x509_nameTypeURI, Class: 2, Bytes: []byte(uriStr)})
|
|
}
|
|
return asn1.Marshal(rawValues)
|
|
}
|
|
|
|
func x509_isIA5String(s string) error {
|
|
for _, r := range s {
|
|
// Per RFC5280 "IA5String is limited to the set of ASCII characters"
|
|
if r > unicode.MaxASCII {
|
|
return fmt.Errorf("x509: %q cannot be encoded as an IA5String", s)
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|