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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.
//go:build ignore
// +build ignore
// Generates root_darwin_armx.go.
//
// As of iOS 8, there is no API for querying the system trusted X.509 root
// certificates. We could use SecTrustEvaluate to verify that a trust chain
// exists for a certificate, but the x509 API requires returning the entire
// chain.
//
// Apple publishes the list of trusted root certificates for iOS on
// support.apple.com. So we parse the list and extract the certificates from
// an OS X machine and embed them into the x509 package.
package main
import (
"bytes"
"crypto/sha256"
"encoding/hex"
"encoding/pem"
"flag"
"fmt"
"go/format"
"io"
"log"
"net/http"
"os"
"os/exec"
"regexp"
"strings"
"github.com/google/certificate-transparency-go/x509"
)
var output = flag.String("output", "root_darwin_armx.go", "file name to write")
func main() {
certs, err := selectCerts()
if err != nil {
log.Fatal(err)
}
buf := new(bytes.Buffer)
fmt.Fprintf(buf, "// Code generated by root_darwin_arm_gen --output %s; DO NOT EDIT.\n", *output)
fmt.Fprintf(buf, "%s", header)
fmt.Fprintf(buf, "const systemRootsPEM = `\n")
for _, cert := range certs {
b := &pem.Block{
Type: "CERTIFICATE",
Bytes: cert.Raw,
}
if err := pem.Encode(buf, b); err != nil {
log.Fatal(err)
}
}
fmt.Fprintf(buf, "`")
source, err := format.Source(buf.Bytes())
if err != nil {
log.Fatal("source format error:", err)
}
if err := os.WriteFile(*output, source, 0644); err != nil {
log.Fatal(err)
}
}
func selectCerts() ([]*x509.Certificate, error) {
ids, err := fetchCertIDs()
if err != nil {
return nil, err
}
scerts, err := sysCerts()
if err != nil {
return nil, err
}
var certs []*x509.Certificate
for _, id := range ids {
if c, ok := scerts[id.fingerprint]; ok {
certs = append(certs, c)
} else {
fmt.Printf("WARNING: cannot find certificate: %s (fingerprint: %s)\n", id.name, id.fingerprint)
}
}
return certs, nil
}
func sysCerts() (certs map[string]*x509.Certificate, err error) {
cmd := exec.Command("/usr/bin/security", "find-certificate", "-a", "-p", "/System/Library/Keychains/SystemRootCertificates.keychain")
data, err := cmd.Output()
if err != nil {
return nil, err
}
certs = make(map[string]*x509.Certificate)
for len(data) > 0 {
var block *pem.Block
block, data = pem.Decode(data)
if block == nil {
break
}
if block.Type != "CERTIFICATE" || len(block.Headers) != 0 {
continue
}
cert, err := x509.ParseCertificate(block.Bytes)
if err != nil {
continue
}
fingerprint := sha256.Sum256(cert.Raw)
certs[hex.EncodeToString(fingerprint[:])] = cert
}
return certs, nil
}
type certID struct {
name string
fingerprint string
}
// fetchCertIDs fetches IDs of iOS X509 certificates from apple.com.
func fetchCertIDs() ([]certID, error) {
// Download the iOS 11 support page. The index for all iOS versions is here:
// https://support.apple.com/en-us/HT204132
resp, err := http.Get("https://support.apple.com/en-us/HT208125")
if err != nil {
return nil, err
}
defer resp.Body.Close()
body, err := io.ReadAll(resp.Body)
if err != nil {
return nil, err
}
text := string(body)
text = text[strings.Index(text, "<div id=trusted"):]
text = text[:strings.Index(text, "</div>")]
var ids []certID
cols := make(map[string]int)
for i, rowmatch := range regexp.MustCompile("(?s)<tr>(.*?)</tr>").FindAllStringSubmatch(text, -1) {
row := rowmatch[1]
if i == 0 {
// Parse table header row to extract column names
for i, match := range regexp.MustCompile("(?s)<th>(.*?)</th>").FindAllStringSubmatch(row, -1) {
cols[match[1]] = i
}
continue
}
values := regexp.MustCompile("(?s)<td>(.*?)</td>").FindAllStringSubmatch(row, -1)
name := values[cols["Certificate name"]][1]
fingerprint := values[cols["Fingerprint (SHA-256)"]][1]
fingerprint = strings.ReplaceAll(fingerprint, "<br>", "")
fingerprint = strings.ReplaceAll(fingerprint, "\n", "")
fingerprint = strings.ReplaceAll(fingerprint, " ", "")
fingerprint = strings.ToLower(fingerprint)
ids = append(ids, certID{
name: name,
fingerprint: fingerprint,
})
}
return ids, nil
}
const header = `
// 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 cgo
// +build darwin
// +build arm arm64 ios
package x509
func loadSystemRoots() (*CertPool, error) {
p := NewCertPool()
p.AppendCertsFromPEM([]byte(systemRootsPEM))
return p, nil
}
`
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