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//go:build standalone
package main
import (
"crypto/x509"
"encoding/pem"
"fmt"
"io"
"net/url"
"os"
"sort"
"strings"
"git.lukeshu.com/dashboard/bin-src/util"
)
type Cert struct {
Url string
X509 *x509.Certificate
}
func (cert Cert) WriteTo(w io.Writer, action string) error {
block := pem.Block{
Type: "CERTIFICATE",
Headers: map[string]string{
"X-Crt-Sh-Url": cert.Url,
"X-Diff-Action": action,
},
Bytes: cert.X509.Raw,
}
return pem.Encode(w, &block)
}
func readTLS(filename string) (map[string]Cert, error) {
//nolint:gosec // that's the point
file, err := os.Open(filename)
if err != nil {
return nil, err
}
data, err := io.ReadAll(file)
if err != nil {
return nil, err
}
ret := make(map[string]Cert)
for len(data) > 0 {
var certPem *pem.Block
certPem, data = pem.Decode(data)
certX509, err := x509.ParseCertificate(certPem.Bytes)
if err != nil {
u, err2 := url.Parse(certPem.Headers["X-Socket"])
if err2 != nil {
return nil, fmt.Errorf("could not get cert or even parse URL:\ncert: %w\nurl: %w", err, err2)
}
ret[strings.Split(u.Host, ":")[0]] = Cert{
X509: new(x509.Certificate),
}
} else {
ret[certX509.Subject.CommonName] = Cert{
Url: fmt.Sprintf("https://crt.sh/?serial=%036x", certX509.SerialNumber),
X509: certX509,
}
}
}
return ret, nil
}
func readCrtSh(filename string, hosts []string) (map[string]Cert, error) {
//nolint:gosec // that's the point
file, err := os.Open(filename)
if err != nil {
return nil, err
}
data, err := io.ReadAll(file)
if err != nil {
return nil, err
}
ret := make(map[string]Cert)
for len(data) > 0 {
var certPem *pem.Block
certPem, data = pem.Decode(data)
certX509, err := x509.ParseCertificate(certPem.Bytes)
if err != nil {
return nil, err
}
if util.IsPrecertificate(certX509) {
continue
}
for _, host := range hosts {
if certX509.VerifyHostname(host) == nil {
if old, haveold := ret[host]; !haveold || certX509.NotBefore.After(old.X509.NotBefore) {
ret[host] = Cert{
Url: certPem.Headers["X-Crt-Sh-Url"],
X509: certX509,
}
}
}
}
}
return ret, nil
}
func keys(m map[string]Cert) []string {
ret := make([]string, len(m))
i := 0
for k := range m {
ret[i] = k
i++
}
sort.Strings(ret)
return ret
}
func main() {
if len(os.Args) != 3 {
_, _ = fmt.Fprintf(os.Stderr, "Usage: %s TLS-file crt.sh-file\n", os.Args[0])
os.Exit(2)
}
if err := mainWithError(os.Args[1], os.Args[2]); err != nil {
_, _ = fmt.Fprintf(os.Stderr, "%s: error: %v", os.Args[0], err)
os.Exit(1)
}
}
func mainWithError(filenameTLS string, filenameCrtSh string) error {
certsTLS, err := readTLS(filenameTLS)
if err != nil {
return fmt.Errorf("could load TLS file: %w", err)
}
hostsTLS := keys(certsTLS)
certsCrtSh, err := readCrtSh(filenameCrtSh, hostsTLS)
if err != nil {
return fmt.Errorf("could load crt.sh file: %w", err)
}
for _, host := range hostsTLS {
certTLS := certsTLS[host]
certCrtSh, haveCrtSh := certsCrtSh[host]
switch {
case !haveCrtSh:
if err := certTLS.WriteTo(os.Stdout, "del"); err != nil {
return fmt.Errorf("could not encode PEM: %w", err)
}
case !certTLS.X509.Equal(certCrtSh.X509):
if err := certTLS.WriteTo(os.Stdout, "del"); err != nil {
return fmt.Errorf("could not encode PEM: %w", err)
}
if err := certCrtSh.WriteTo(os.Stdout, "add"); err != nil {
return fmt.Errorf("could not encode PEM: %w", err)
}
default:
if err := certCrtSh.WriteTo(os.Stdout, "ctx"); err != nil {
return fmt.Errorf("could not encode PEM: %w", err)
}
}
}
return nil
}
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