goutils/cmd/certdump/certdump.go

309 lines
6.8 KiB
Go

package main
import (
"bytes"
"crypto/dsa"
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rsa"
"crypto/tls"
"crypto/x509"
"crypto/x509/pkix"
"flag"
"fmt"
"io/ioutil"
"os"
"strings"
"github.com/cloudflare/cfssl/helpers"
)
func certPublic(cert *x509.Certificate) string {
switch pub := cert.PublicKey.(type) {
case *rsa.PublicKey:
return fmt.Sprintf("RSA-%d", pub.N.BitLen())
case *ecdsa.PublicKey:
switch pub.Curve {
case elliptic.P256():
return "ECDSA-prime256v1"
case elliptic.P384():
return "ECDSA-secp384r1"
case elliptic.P521():
return "ECDSA-secp521r1"
default:
return "ECDSA (unknown curve)"
}
case *dsa.PublicKey:
return "DSA"
default:
return "Unknown"
}
}
func displayName(name pkix.Name) string {
var ns []string
if name.CommonName != "" {
ns = append(ns, name.CommonName)
}
for i := range name.Country {
ns = append(ns, fmt.Sprintf("C=%s", name.Country[i]))
}
for i := range name.Organization {
ns = append(ns, fmt.Sprintf("O=%s", name.Organization[i]))
}
for i := range name.OrganizationalUnit {
ns = append(ns, fmt.Sprintf("OU=%s", name.OrganizationalUnit[i]))
}
for i := range name.Locality {
ns = append(ns, fmt.Sprintf("L=%s", name.Locality[i]))
}
for i := range name.Province {
ns = append(ns, fmt.Sprintf("ST=%s", name.Province[i]))
}
if len(ns) > 0 {
return "/" + strings.Join(ns, "/")
}
return "*** no subject information ***"
}
func keyUsages(ku x509.KeyUsage) string {
var uses []string
for u, s := range keyUsage {
if (ku & u) != 0 {
uses = append(uses, s)
}
}
return strings.Join(uses, ", ")
}
func extUsage(ext []x509.ExtKeyUsage) string {
ns := make([]string, 0, len(ext))
for i := range ext {
ns = append(ns, extKeyUsages[ext[i]])
}
return strings.Join(ns, ", ")
}
func showBasicConstraints(cert *x509.Certificate) {
fmt.Printf("\tBasic constraints: ")
if cert.BasicConstraintsValid {
fmt.Printf("valid")
} else {
fmt.Printf("invalid")
}
if cert.IsCA {
fmt.Printf(", is a CA certificate")
}
if (cert.MaxPathLen == 0 && cert.MaxPathLenZero) || (cert.MaxPathLen > 0) {
fmt.Printf(", max path length %d", cert.MaxPathLen)
}
fmt.Printf("\n")
}
const oneTrueDateFormat = "2006-01-02T15:04:05-0700"
var dateFormat string
func wrapPrint(text string, indent int) {
tabs := ""
for i := 0; i < indent; i++ {
tabs += "\t"
}
fmt.Printf(tabs+"%s\n", wrap(text, indent))
}
func displayCert(cert *x509.Certificate) {
fmt.Println("CERTIFICATE")
fmt.Println(wrap("Subject: "+displayName(cert.Subject), 0))
fmt.Println(wrap("Issuer: "+displayName(cert.Issuer), 0))
fmt.Printf("\tSignature algorithm: %s / %s\n", sigAlgoPK(cert.SignatureAlgorithm),
sigAlgoHash(cert.SignatureAlgorithm))
fmt.Println("Details:")
wrapPrint("Public key: "+certPublic(cert), 1)
fmt.Printf("\tSerial number: %s\n", cert.SerialNumber)
if len(cert.AuthorityKeyId) > 0 {
fmt.Printf("\t%s\n", wrap("AKI: "+dumpHex(cert.AuthorityKeyId), 1))
}
if len(cert.SubjectKeyId) > 0 {
fmt.Printf("\t%s\n", wrap("SKI: "+dumpHex(cert.SubjectKeyId), 1))
}
wrapPrint("Valid from: "+cert.NotBefore.Format(dateFormat), 1)
fmt.Printf("\t until: %s\n", cert.NotAfter.Format(dateFormat))
fmt.Printf("\tKey usages: %s\n", keyUsages(cert.KeyUsage))
if len(cert.ExtKeyUsage) > 0 {
fmt.Printf("\tExtended usages: %s\n", extUsage(cert.ExtKeyUsage))
}
showBasicConstraints(cert)
validNames := make([]string, 0, len(cert.DNSNames)+len(cert.EmailAddresses)+len(cert.IPAddresses))
for i := range cert.DNSNames {
validNames = append(validNames, "dns:"+cert.DNSNames[i])
}
for i := range cert.EmailAddresses {
validNames = append(validNames, "email:"+cert.EmailAddresses[i])
}
for i := range cert.IPAddresses {
validNames = append(validNames, "ip:"+cert.IPAddresses[i].String())
}
sans := fmt.Sprintf("SANs (%d): %s\n", len(validNames), strings.Join(validNames, ", "))
wrapPrint(sans, 1)
l := len(cert.IssuingCertificateURL)
if l != 0 {
var aia string
if l == 1 {
aia = "AIA"
} else {
aia = "AIAs"
}
wrapPrint(fmt.Sprintf("%d %s:", l, aia), 1)
for _, url := range cert.IssuingCertificateURL {
wrapPrint(url, 2)
}
}
l = len(cert.OCSPServer)
if l > 0 {
title := "OCSP server"
if l > 1 {
title += "s"
}
wrapPrint(title+":\n", 1)
for _, ocspServer := range cert.OCSPServer {
wrapPrint(fmt.Sprintf("- %s\n", ocspServer), 2)
}
}
}
func displayAllCerts(in []byte, leafOnly bool) {
certs, err := helpers.ParseCertificatesPEM(in)
if err != nil {
certs, _, err = helpers.ParseCertificatesDER(in, "")
if err != nil {
Warn(TranslateCFSSLError(err), "failed to parse certificates")
return
}
}
if len(certs) == 0 {
Warnx("no certificates found")
return
}
if leafOnly {
displayCert(certs[0])
return
}
for i := range certs {
displayCert(certs[i])
}
}
func displayAllCertsWeb(uri string, leafOnly bool) {
ci := getConnInfo(uri)
conn, err := tls.Dial("tcp", ci.Addr, permissiveConfig())
if err != nil {
Warn(err, "couldn't connect to %s", ci.Addr)
return
}
defer conn.Close()
state := conn.ConnectionState()
conn.Close()
conn, err = tls.Dial("tcp", ci.Addr, verifyConfig(ci.Host))
if err == nil {
err = conn.VerifyHostname(ci.Host)
if err == nil {
state = conn.ConnectionState()
}
conn.Close()
} else {
Warn(err, "TLS verification error with server name %s", ci.Host)
}
if len(state.PeerCertificates) == 0 {
Warnx("no certificates found")
return
}
if leafOnly {
displayCert(state.PeerCertificates[0])
return
}
if len(state.VerifiedChains) == 0 {
Warnx("no verified chains found; using peer chain")
for i := range state.PeerCertificates {
displayCert(state.PeerCertificates[i])
}
} else {
fmt.Println("TLS chain verified successfully.")
for i := range state.VerifiedChains {
fmt.Printf("--- Verified certificate chain %d ---\n", i+1)
for j := range state.VerifiedChains[i] {
displayCert(state.VerifiedChains[i][j])
}
}
}
}
func main() {
var leafOnly bool
flag.StringVar(&dateFormat, "s", oneTrueDateFormat, "date `format` in Go time format")
flag.BoolVar(&leafOnly, "l", false, "only show the leaf certificate")
flag.Parse()
if flag.NArg() == 0 || (flag.NArg() == 1 && flag.Arg(0) == "-") {
certs, err := ioutil.ReadAll(os.Stdin)
if err != nil {
Warn(err, "couldn't read certificates from standard input")
os.Exit(1)
}
// This is needed for getting certs from JSON/jq.
certs = bytes.TrimSpace(certs)
certs = bytes.Replace(certs, []byte(`\n`), []byte{0xa}, -1)
certs = bytes.Trim(certs, `"`)
displayAllCerts(certs, leafOnly)
} else {
for _, filename := range flag.Args() {
fmt.Printf("--%s ---\n", filename)
if strings.HasPrefix(filename, "https://") {
displayAllCertsWeb(filename, leafOnly)
} else {
in, err := ioutil.ReadFile(filename)
if err != nil {
Warn(err, "couldn't read certificate")
continue
}
displayAllCerts(in, leafOnly)
}
}
}
}