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// Copyright 2015 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.
// +build ignore
// Generates root_ios.go.
//
// As of iOS 13, there is no API for querying the system trusted X.509 root
// certificates.
//
// Apple publishes the trusted root certificates for iOS and macOS on
// opensource.apple.com so we embed them into the x509 package.
//
// Note that this ignores distrusted and revoked certificates.
package main
import (
"archive/tar"
"bytes"
"compress/gzip"
"crypto/sha256"
"crypto/tls"
"crypto/x509"
"encoding/pem"
"flag"
"fmt"
"go/format"
"io"
"io/ioutil"
"log"
"net/http"
"path"
"sort"
"strings"
"time"
)
func main() {
var output = flag.String("output", "root_ios.go", "file name to write")
var version = flag.String("version", "", "security_certificates version")
flag.Parse()
if *version == "" {
log.Fatal("Select the latest security_certificates version from " +
"https://opensource.apple.com/source/security_certificates/")
}
url := "https://opensource.apple.com/tarballs/security_certificates/security_certificates-%s.tar.gz"
hc := &http.Client{Timeout: 1 * time.Minute}
resp, err := hc.Get(fmt.Sprintf(url, *version))
if err != nil {
log.Fatal(err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
log.Fatalf("HTTP status not OK: %s", resp.Status)
}
zr, err := gzip.NewReader(resp.Body)
if err != nil {
log.Fatal(err)
}
defer zr.Close()
var certs []*x509.Certificate
pool := x509.NewCertPool()
tr := tar.NewReader(zr)
for {
hdr, err := tr.Next()
if err == io.EOF {
break
}
if err != nil {
log.Fatal(err)
}
rootsDirectory := fmt.Sprintf("security_certificates-%s/certificates/roots/", *version)
if dir, file := path.Split(hdr.Name); hdr.Typeflag != tar.TypeReg ||
dir != rootsDirectory || strings.HasPrefix(file, ".") {
continue
}
der, err := io.ReadAll(tr)
if err != nil {
log.Fatal(err)
}
c, err := x509.ParseCertificate(der)
if err != nil {
log.Printf("Failed to parse certificate %q: %v", hdr.Name, err)
continue
}
certs = append(certs, c)
pool.AddCert(c)
}
// Quick smoke test to check the pool is well formed, and that we didn't end
// up trusting roots in the removed folder.
for _, c := range certs {
if c.Subject.CommonName == "Symantec Class 2 Public Primary Certification Authority - G4" {
log.Fatal("The pool includes a removed root!")
}
}
conn, err := tls.Dial("tcp", "mail.google.com:443", &tls.Config{
RootCAs: pool,
})
if err != nil {
log.Fatal(err)
}
conn.Close()
certName := func(c *x509.Certificate) string {
if c.Subject.CommonName != "" {
return c.Subject.CommonName
}
if len(c.Subject.OrganizationalUnit) > 0 {
return c.Subject.OrganizationalUnit[0]
}
return c.Subject.Organization[0]
}
sort.Slice(certs, func(i, j int) bool {
if strings.ToLower(certName(certs[i])) != strings.ToLower(certName(certs[j])) {
return strings.ToLower(certName(certs[i])) < strings.ToLower(certName(certs[j]))
}
return certs[i].NotBefore.Before(certs[j].NotBefore)
})
out := new(bytes.Buffer)
fmt.Fprintf(out, header, *version)
fmt.Fprintf(out, "const systemRootsPEM = `\n")
for _, c := range certs {
fmt.Fprintf(out, "# %q\n", certName(c))
h := sha256.Sum256(c.Raw)
fmt.Fprintf(out, "# % X\n", h[:len(h)/2])
fmt.Fprintf(out, "# % X\n", h[len(h)/2:])
b := &pem.Block{
Type: "CERTIFICATE",
Bytes: c.Raw,
}
if err := pem.Encode(out, b); err != nil {
log.Fatal(err)
}
}
fmt.Fprintf(out, "`")
source, err := format.Source(out.Bytes())
if err != nil {
log.Fatal(err)
}
if err := ioutil.WriteFile(*output, source, 0644); err != nil {
log.Fatal(err)
}
}
const header = `// Code generated by root_ios_gen.go -version %s; DO NOT EDIT.
// Update the version in root.go and regenerate with "go generate".
// +build ios
// +build !x509omitbundledroots
package x509
func (c *Certificate) systemVerify(opts *VerifyOptions) (chains [][]*Certificate, err error) {
return nil, nil
}
// loadSystemRootsWithCgo is not available on iOS.
var loadSystemRootsWithCgo func() (*CertPool, error)
func loadSystemRoots() (*CertPool, error) {
p := NewCertPool()
p.AppendCertsFromPEM([]byte(systemRootsPEM))
return p, nil
}
`
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