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// Copyright 2011 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 x509andr
import (
"encoding/pem"
"errors"
"runtime"
)
// CertPool is a set of certificates.
type CertPool struct {
bySubjectKeyId map[string][]int
byName map[string][]int
certs []*Certificate
}
// NewCertPool returns a new, empty CertPool.
func NewCertPool() *CertPool {
return &CertPool{
bySubjectKeyId: make(map[string][]int),
byName: make(map[string][]int),
}
}
// SystemCertPool returns a copy of the system cert pool.
//
// Any mutations to the returned pool are not written to disk and do
// not affect any other pool.
func SystemCertPool() (*CertPool, error) {
if runtime.GOOS == "windows" {
// Issue 16736, 18609:
return nil, errors.New("crypto/x509: system root pool is not available on Windows")
}
return loadSystemRoots()
}
// findVerifiedParents attempts to find certificates in s which have signed the
// given certificate. If any candidates were rejected then errCert will be set
// to one of them, arbitrarily, and err will contain the reason that it was
// rejected.
func (s *CertPool) findVerifiedParents(cert *Certificate) (parents []int, errCert *Certificate, err error) {
if s == nil {
return
}
var candidates []int
if len(cert.AuthorityKeyId) > 0 {
candidates = s.bySubjectKeyId[string(cert.AuthorityKeyId)]
}
if len(candidates) == 0 {
candidates = s.byName[string(cert.RawIssuer)]
}
for _, c := range candidates {
if err = cert.CheckSignatureFrom(s.certs[c]); err == nil {
parents = append(parents, c)
} else {
errCert = s.certs[c]
}
}
return
}
func (s *CertPool) contains(cert *Certificate) bool {
if s == nil {
return false
}
candidates := s.byName[string(cert.RawSubject)]
for _, c := range candidates {
if s.certs[c].Equal(cert) {
return true
}
}
return false
}
// AddCert adds a certificate to a pool.
func (s *CertPool) AddCert(cert *Certificate) {
if cert == nil {
panic("adding nil Certificate to CertPool")
}
// Check that the certificate isn't being added twice.
if s.contains(cert) {
return
}
n := len(s.certs)
s.certs = append(s.certs, cert)
if len(cert.SubjectKeyId) > 0 {
keyId := string(cert.SubjectKeyId)
s.bySubjectKeyId[keyId] = append(s.bySubjectKeyId[keyId], n)
}
name := string(cert.RawSubject)
s.byName[name] = append(s.byName[name], n)
}
// AppendCertsFromPEM attempts to parse a series of PEM encoded certificates.
// It appends any certificates found to s and reports whether any certificates
// were successfully parsed.
//
// On many Linux systems, /etc/ssl/cert.pem will contain the system wide set
// of root CAs in a format suitable for this function.
func (s *CertPool) AppendCertsFromPEM(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 := ParseCertificate(block.Bytes)
if err != nil {
continue
}
s.AddCert(cert)
ok = true
}
return
}
// Subjects returns a list of the DER-encoded subjects of
// all of the certificates in the pool.
func (s *CertPool) Subjects() [][]byte {
res := make([][]byte, len(s.certs))
for i, c := range s.certs {
res[i] = c.RawSubject
}
return res
}
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