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