Add certdump util.
This commit is contained in:
Kyle Isom
parent
da9e2e7184
commit
df5100bc30
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@ -0,0 +1,208 @@
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package main
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import (
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"crypto/dsa"
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"crypto/ecdsa"
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"crypto/elliptic"
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"crypto/rsa"
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"crypto/x509"
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"crypto/x509/pkix"
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"flag"
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"fmt"
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"io/ioutil"
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"strings"
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"github.com/cloudflare/cfssl/helpers"
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)
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func certPublic(cert *x509.Certificate) string {
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switch pub := cert.PublicKey.(type) {
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case *rsa.PublicKey:
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return fmt.Sprintf("RSA-%d", pub.N.BitLen())
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case *ecdsa.PublicKey:
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switch pub.Curve {
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case elliptic.P256():
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return "ECDSA-prime256v1"
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case elliptic.P384():
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return "ECDSA-secp384r1"
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case elliptic.P521():
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return "ECDSA-secp521r1"
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default:
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return "ECDSA (unknown curve)"
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}
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case *dsa.PublicKey:
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return "DSA"
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default:
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return "Unknown"
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}
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}
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func displayName(name pkix.Name) string {
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var ns []string
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if name.CommonName != "" {
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ns = append(ns, name.CommonName)
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}
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for i := range name.Country {
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ns = append(ns, fmt.Sprintf("C=%s", name.Country[i]))
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}
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for i := range name.Organization {
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ns = append(ns, fmt.Sprintf("O=%s", name.Organization[i]))
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}
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for i := range name.OrganizationalUnit {
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ns = append(ns, fmt.Sprintf("OU=%s", name.OrganizationalUnit[i]))
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}
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for i := range name.Locality {
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ns = append(ns, fmt.Sprintf("L=%s", name.Locality[i]))
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}
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for i := range name.Province {
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ns = append(ns, fmt.Sprintf("ST=%s", name.Province[i]))
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}
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if len(ns) > 0 {
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return "/" + strings.Join(ns, "/")
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}
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return "*** no subject information ***"
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}
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func keyUsages(ku x509.KeyUsage) string {
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var uses []string
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for u, s := range KeyUsage {
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if (ku & u) != 0 {
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uses = append(uses, s)
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}
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}
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return strings.Join(uses, ", ")
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}
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func extUsage(ext []x509.ExtKeyUsage) string {
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ns := make([]string, 0, len(ext))
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for i := range ext {
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ns = append(ns, ExtKeyUsages[ext[i]])
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}
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return strings.Join(ns, ", ")
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}
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func showBasicConstraints(cert *x509.Certificate) {
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fmt.Printf("\tBasic constraints: ")
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if cert.BasicConstraintsValid {
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fmt.Printf("valid")
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} else {
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fmt.Printf("invalid")
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}
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if cert.IsCA {
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fmt.Printf(", is a CA certificate")
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}
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if (cert.MaxPathLen == 0 && cert.MaxPathLenZero) || (cert.MaxPathLen > 0) {
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fmt.Printf(", max path length %d", cert.MaxPathLen)
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}
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fmt.Printf("\n")
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}
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const oneTrueDateFormat = "2006-01-02T15:04:05-0700"
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var dateFormat string
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func wrapPrint(text string, indent int) {
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tabs := ""
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for i := 0; i < indent; i++ {
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tabs += "\t"
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}
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fmt.Printf(tabs+"%s\n", wrap(text, indent))
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}
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func displayCert(cert *x509.Certificate) {
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fmt.Println("CERTIFICATE")
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fmt.Println(wrap("Subject: "+displayName(cert.Subject), 0))
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fmt.Println(wrap("Issuer: "+displayName(cert.Issuer), 0))
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fmt.Printf("\tSignature algorithm: %s / %s\n", sigAlgoPK(cert.SignatureAlgorithm),
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sigAlgoHash(cert.SignatureAlgorithm))
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fmt.Println("Details:")
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wrapPrint("Public key: "+certPublic(cert), 1)
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fmt.Printf("\tSerial number: %s\n", cert.SerialNumber)
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if len(cert.AuthorityKeyId) > 0 {
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fmt.Printf("\t%s\n", wrap("AKI: "+dumpHex(cert.AuthorityKeyId), 1))
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}
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if len(cert.SubjectKeyId) > 0 {
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fmt.Printf("\t%s\n", wrap("SKI: "+dumpHex(cert.SubjectKeyId), 1))
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}
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wrapPrint("Valid from: "+cert.NotBefore.Format(dateFormat), 1)
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fmt.Printf("\t until: %s\n", cert.NotAfter.Format(dateFormat))
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fmt.Printf("\tKey usages: %s\n", keyUsages(cert.KeyUsage))
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if len(cert.ExtKeyUsage) > 0 {
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fmt.Printf("\tExtended usages: %s\n", extUsage(cert.ExtKeyUsage))
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}
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showBasicConstraints(cert)
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validNames := make([]string, 0, len(cert.DNSNames)+len(cert.EmailAddresses)+len(cert.IPAddresses))
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for i := range cert.DNSNames {
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validNames = append(validNames, cert.DNSNames[i])
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}
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for i := range cert.EmailAddresses {
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validNames = append(validNames, cert.EmailAddresses[i])
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}
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for i := range cert.IPAddresses {
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validNames = append(validNames, cert.IPAddresses[i].String())
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}
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wrapPrint("SANs: "+strings.Join(validNames, ", "), 1)
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}
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func displayAllCerts(in []byte, leafOnly bool) {
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certs, err := helpers.ParseCertificatesPEM(in)
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if err != nil {
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Warn(TranslateCFSSLError(err), "failed to parse certificates")
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return
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}
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if len(certs) == 0 {
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Warnx("no certificates found")
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return
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}
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if leafOnly {
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displayCert(certs[0])
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return
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}
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for i := range certs {
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displayCert(certs[i])
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}
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}
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func main() {
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var leafOnly bool
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flag.StringVar(&dateFormat, "s", oneTrueDateFormat, "date `format` in Go time format")
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flag.BoolVar(&leafOnly, "l", false, "only show the leaf certificate")
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flag.Parse()
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for _, filename := range flag.Args() {
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fmt.Printf("--%s ---\n", filename)
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in, err := ioutil.ReadFile(filename)
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if err != nil {
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Warn(err, "couldn't read certificate")
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continue
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}
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displayAllCerts(in, leafOnly)
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}
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}
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@ -0,0 +1,159 @@
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package main
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import (
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"crypto/x509"
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"errors"
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"fmt"
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"os"
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"strings"
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cferr "github.com/cloudflare/cfssl/errors"
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"github.com/kr/text"
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)
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// following two lifted from CFSSL, (replace-regexp "\(.+\): \(.+\),"
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// "\2: \1,")
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var KeyUsage = map[x509.KeyUsage]string{
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x509.KeyUsageDigitalSignature: "digital signature",
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x509.KeyUsageContentCommitment: "content committment",
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x509.KeyUsageKeyEncipherment: "key encipherment",
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x509.KeyUsageKeyAgreement: "key agreement",
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x509.KeyUsageDataEncipherment: "data encipherment",
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x509.KeyUsageCertSign: "cert sign",
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x509.KeyUsageCRLSign: "crl sign",
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x509.KeyUsageEncipherOnly: "encipher only",
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x509.KeyUsageDecipherOnly: "decipher only",
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}
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var ExtKeyUsages = map[x509.ExtKeyUsage]string{
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x509.ExtKeyUsageAny: "any",
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x509.ExtKeyUsageServerAuth: "server auth",
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x509.ExtKeyUsageClientAuth: "client auth",
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x509.ExtKeyUsageCodeSigning: "code signing",
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x509.ExtKeyUsageEmailProtection: "s/mime",
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x509.ExtKeyUsageIPSECEndSystem: "ipsec end system",
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x509.ExtKeyUsageIPSECTunnel: "ipsec tunnel",
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x509.ExtKeyUsageIPSECUser: "ipsec user",
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x509.ExtKeyUsageTimeStamping: "timestamping",
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x509.ExtKeyUsageOCSPSigning: "ocsp signing",
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x509.ExtKeyUsageMicrosoftServerGatedCrypto: "microsoft sgc",
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x509.ExtKeyUsageNetscapeServerGatedCrypto: "netscape sgc",
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}
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func pubKeyAlgo(a x509.PublicKeyAlgorithm) string {
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switch a {
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case x509.RSA:
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return "RSA"
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case x509.ECDSA:
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return "ECDSA"
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case x509.DSA:
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return "DSA"
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default:
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return "unknown public key algorithm"
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}
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}
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func sigAlgoPK(a x509.SignatureAlgorithm) string {
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switch a {
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case x509.MD2WithRSA, x509.MD5WithRSA, x509.SHA1WithRSA, x509.SHA256WithRSA, x509.SHA384WithRSA, x509.SHA512WithRSA:
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return "RSA"
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case x509.ECDSAWithSHA1, x509.ECDSAWithSHA256, x509.ECDSAWithSHA384, x509.ECDSAWithSHA512:
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return "ECDSA"
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case x509.DSAWithSHA1, x509.DSAWithSHA256:
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return "DSA"
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default:
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return "unknown public key algorithm"
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}
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}
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func sigAlgoHash(a x509.SignatureAlgorithm) string {
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switch a {
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case x509.MD2WithRSA:
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return "MD2"
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case x509.MD5WithRSA:
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return "MD5"
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case x509.SHA1WithRSA, x509.ECDSAWithSHA1, x509.DSAWithSHA1:
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return "SHA1"
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case x509.SHA256WithRSA, x509.ECDSAWithSHA256, x509.DSAWithSHA256:
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return "SHA256"
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case x509.SHA384WithRSA, x509.ECDSAWithSHA384:
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return "SHA384"
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case x509.SHA512WithRSA, x509.ECDSAWithSHA512:
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return "SHA512"
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default:
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return "unknown hash algorithm"
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}
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}
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// TranslateCFSSLError turns a CFSSL error into a more readable string.
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func TranslateCFSSLError(err error) error {
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if err == nil {
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return nil
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}
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// printing errors as json is terrible
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if cfsslError, ok := err.(*cferr.Error); ok {
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err = errors.New(cfsslError.Message)
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}
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return err
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}
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// Warnx displays a formatted error message to standard error, à la
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// warnx(3).
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func Warnx(format string, a ...interface{}) (int, error) {
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format += "\n"
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return fmt.Fprintf(os.Stderr, format, a...)
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}
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// Warn displays a formatted error message to standard output,
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// appending the error string, à la warn(3).
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func Warn(err error, format string, a ...interface{}) (int, error) {
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format += ": %v\n"
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a = append(a, err)
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return fmt.Fprintf(os.Stderr, format, a...)
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}
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const maxLine = 78
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func makeIndent(n int) string {
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s := " "
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for i := 0; i < n; i++ {
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s += " "
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}
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return s
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}
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func indentLen(n int) int {
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return 4 + (8 * n)
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}
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// this isn't real efficient, but that's not a problem here
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func wrap(s string, indent int) string {
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if indent > 3 {
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indent = 3
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}
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wrapped := text.Wrap(s, maxLine)
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lines := strings.SplitN(wrapped, "\n", 2)
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if len(lines) == 1 {
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return lines[0]
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}
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if (maxLine - indentLen(indent)) <= 0 {
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panic("too much indentation")
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}
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rest := strings.Join(lines[1:], " ")
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wrapped = text.Wrap(rest, maxLine-indentLen(indent))
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return lines[0] + "\n" + text.Indent(wrapped, makeIndent(indent))
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}
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func dumpHex(in []byte) string {
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var s string
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for i := range in {
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s += fmt.Sprintf("%02X:", in[i])
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}
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return strings.Trim(s, ":")
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}
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