|
1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889 |
- // Copyright 2009 The Go Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style
- // license that can be found in the LICENSE file.
-
- package tls
-
- import (
- "crypto/x509"
- "encoding/pem"
- "strings"
- )
-
- // A CASet is a set of certificates.
- type CASet struct {
- bySubjectKeyId map[string][]*x509.Certificate
- byName map[string][]*x509.Certificate
- }
-
- // NewCASet returns a new, empty CASet.
- func NewCASet() *CASet {
- return &CASet{
- make(map[string][]*x509.Certificate),
- make(map[string][]*x509.Certificate),
- }
- }
-
- func nameToKey(name *x509.Name) string {
- return strings.Join(name.Country, ",") + "/" + strings.Join(name.Organization, ",") + "/" + strings.Join(name.OrganizationalUnit, ",") + "/" + name.CommonName
- }
-
- // FindVerifiedParent attempts to find the certificate in s which has signed
- // the given certificate. If no such certificate can be found or the signature
- // doesn't match, it returns nil.
- func (s *CASet) FindVerifiedParent(cert *x509.Certificate) (parent *x509.Certificate) {
- var candidates []*x509.Certificate
-
- if len(cert.AuthorityKeyId) > 0 {
- candidates = s.bySubjectKeyId[string(cert.AuthorityKeyId)]
- }
- if len(candidates) == 0 {
- candidates = s.byName[nameToKey(&cert.Issuer)]
- }
-
- for _, c := range candidates {
- if cert.CheckSignatureFrom(c) == nil {
- return c
- }
- }
-
- return nil
- }
-
- // AddCert adds a certificate to the set
- func (s *CASet) AddCert(cert *x509.Certificate) {
- if len(cert.SubjectKeyId) > 0 {
- keyId := string(cert.SubjectKeyId)
- s.bySubjectKeyId[keyId] = append(s.bySubjectKeyId[keyId], cert)
- }
- name := nameToKey(&cert.Subject)
- s.byName[name] = append(s.byName[name], cert)
- }
-
- // SetFromPEM attempts to parse a series of PEM encoded root certificates. It
- // appends any certificates found to s and returns true if any certificates
- // were successfully parsed. On many Linux systems, /etc/ssl/cert.pem will
- // contains the system wide set of root CAs in a format suitable for this
- // function.
- func (s *CASet) SetFromPEM(pemCerts []byte) (ok bool) {
- for len(pemCerts) > 0 {
- var block *pem.Block
- block, pemCerts = pem.Decode(pemCerts)
- if block == nil {
- break
- }
- if block.Type != "CERTIFICATE" || len(block.Headers) != 0 {
- continue
- }
-
- cert, err := x509.ParseCertificate(block.Bytes)
- if err != nil {
- continue
- }
-
- s.AddCert(cert)
- ok = true
- }
-
- return
- }
|