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tls.go
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tls.go
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package main
import (
"crypto/ecdsa"
"crypto/ed25519"
"crypto/rsa"
"crypto/tls"
"crypto/x509"
"fmt"
"strings"
"github.com/shuque/dane"
)
// TLSversion2string - map TLS verson number to string
var TLSversion2string = map[uint16]string{
tls.VersionTLS10: "1.0",
tls.VersionTLS11: "1.1",
tls.VersionTLS12: "1.2",
tls.VersionTLS13: "1.3",
}
// TLSstring2version - map TLS version string to number
var TLSstring2version = map[string]uint16{
"1.0": tls.VersionTLS10,
"1.1": tls.VersionTLS11,
"1.2": tls.VersionTLS12,
"1.3": tls.VersionTLS13,
}
// KeyUsage value to string
var KeyUsage = map[x509.KeyUsage]string{
x509.KeyUsageDigitalSignature: "DigitalSignature",
x509.KeyUsageContentCommitment: "ContentCommitment",
x509.KeyUsageKeyEncipherment: "KeyEncipherment",
x509.KeyUsageDataEncipherment: "DataEncipherment",
x509.KeyUsageKeyAgreement: "KeyAgreement",
x509.KeyUsageCertSign: "CertSign",
x509.KeyUsageCRLSign: "CRLSign",
x509.KeyUsageEncipherOnly: "EncipherOnly",
x509.KeyUsageDecipherOnly: "DecipherOnly",
}
// ExtendedKeyUsage value to string
var ExtendedKeyUsage = map[x509.ExtKeyUsage]string{
x509.ExtKeyUsageAny: "Any",
x509.ExtKeyUsageServerAuth: "ServerAuth",
x509.ExtKeyUsageClientAuth: "ClientAuth",
x509.ExtKeyUsageCodeSigning: "CodeSigning",
x509.ExtKeyUsageEmailProtection: "EmailProtection",
x509.ExtKeyUsageIPSECEndSystem: "IPSECEndSystem",
x509.ExtKeyUsageIPSECTunnel: "IPSECTunnel",
x509.ExtKeyUsageIPSECUser: "IPSECUser",
x509.ExtKeyUsageTimeStamping: "TimeStamping",
x509.ExtKeyUsageOCSPSigning: "OCSPSigning",
x509.ExtKeyUsageMicrosoftServerGatedCrypto: "MicrosoftServerGatedCrypto",
x509.ExtKeyUsageNetscapeServerGatedCrypto: "NetscapeServerGatedCrypto",
x509.ExtKeyUsageMicrosoftCommercialCodeSigning: "MicrosoftCommercialCodeSigning",
x509.ExtKeyUsageMicrosoftKernelCodeSigning: "MicrosoftKernelCodeSigning",
}
// KU2Strings -
func KU2Strings(ku x509.KeyUsage) string {
var result []string
for k, v := range KeyUsage {
if ku&k == k {
result = append(result, v)
}
}
return strings.Join(result, " ")
}
// EKU2Strings -
func EKU2Strings(ekulist []x509.ExtKeyUsage) string {
var result []string
for _, eku := range ekulist {
result = append(result, ExtendedKeyUsage[eku])
}
return strings.Join(result, " ")
}
// KeySizeInBits -
func KeySizeInBits(publickey interface{}) int {
switch v := publickey.(type) {
case *rsa.PublicKey:
return v.Size() * 8
case *ecdsa.PublicKey:
return v.X.BitLen() + v.Y.BitLen()
case *ed25519.PublicKey:
return 256
default:
return 0
}
}
// printCertDetails --
// Print some details of the certificate.
func printCertDetails(cert *x509.Certificate) {
fmt.Printf(" X509 version: %d\n", cert.Version)
fmt.Printf(" Serial#: %x\n", cert.SerialNumber)
fmt.Printf(" Subject: %v\n", cert.Subject)
fmt.Printf(" Issuer: %v\n", cert.Issuer)
for _, dnsName := range cert.DNSNames {
fmt.Printf(" SAN dNSName: %s\n", dnsName)
}
for _, ipAddress := range cert.IPAddresses {
fmt.Printf(" SAN IPaddress: %s\n", ipAddress)
}
for _, emailAddress := range cert.EmailAddresses {
fmt.Printf(" SAN emailAddress: %s\n", emailAddress)
}
for _, uri := range cert.URIs {
fmt.Printf(" SAN URI: %v\n", uri)
}
fmt.Printf(" Signature Algorithm: %v\n", cert.SignatureAlgorithm)
fmt.Printf(" PublicKey Algorithm: %v %d-Bits\n",
cert.PublicKeyAlgorithm, KeySizeInBits(cert.PublicKey))
fmt.Printf(" Inception: %v\n", cert.NotBefore)
fmt.Printf(" Expiration: %v\n", cert.NotAfter)
fmt.Printf(" KU: %v\n", KU2Strings(cert.KeyUsage))
fmt.Printf(" EKU: %v\n", EKU2Strings(cert.ExtKeyUsage))
if cert.BasicConstraintsValid {
fmt.Printf(" Is CA?: %v\n", cert.IsCA)
}
fmt.Printf(" SKI: %x\n", cert.SubjectKeyId)
fmt.Printf(" AKI: %x\n", cert.AuthorityKeyId)
fmt.Printf(" OSCP Servers: %v\n", cert.OCSPServer)
fmt.Printf(" CA Issuer URL: %v\n", cert.IssuingCertificateURL)
fmt.Printf(" CRL Distribution: %v\n", cert.CRLDistributionPoints)
fmt.Printf(" Policy OIDs: %v\n", cert.PolicyIdentifiers)
}
// printCertChainDetails -
func printCertChainDetails(chain []*x509.Certificate) {
fmt.Printf("## -------------- FULL Certificate Chain ----------------\n")
for i, cert := range chain {
fmt.Printf("## Certificate at Depth: %d\n", i)
printCertDetails(cert)
}
}
// printCertChains -
func printCertChains(chains [][]*x509.Certificate, name string) {
for i, row := range chains {
fmt.Printf("## %s Certificate Chain %d:\n", name, i)
for j, cert := range row {
fmt.Printf(" %2d %v\n", j, cert.Subject)
fmt.Printf(" %v\n", cert.Issuer)
}
}
}
// printConnectionDetails -
func printConnectionDetails(conn *tls.Conn, config *dane.Config) {
var peerCerts []*x509.Certificate
cs := conn.ConnectionState()
if config.Transcript != "" {
fmt.Printf("## STARTTLS Transcript:\n%s", config.Transcript)
}
fmt.Printf("## Peer Certificate Chain:\n")
for i, cert := range cs.PeerCertificates {
fmt.Printf(" %2d %v\n", i, cert.Subject)
fmt.Printf(" %v\n", cert.Issuer)
}
if !config.NoVerify {
printCertChains(config.PKIXChains, "PKIX")
}
if config.DANE {
printCertChains(config.DANEChains, "DANE")
}
fmt.Printf("## TLS Connection Info:\n")
fmt.Printf(" TLS version: %s\n", TLSversion2string[cs.Version])
fmt.Printf(" CipherSuite: %s\n", tls.CipherSuiteName(cs.CipherSuite))
if cs.NegotiatedProtocol != "" {
fmt.Printf("NegotiatedProtocol: %s\n", cs.NegotiatedProtocol)
}
peerCerts = cs.PeerCertificates
if Options.printchain {
printCertChainDetails(peerCerts)
} else if debug {
fmt.Printf("## End-Entity Certificate Info:\n")
printCertDetails(peerCerts[0])
}
}