145 lines
3.5 KiB
Go
145 lines
3.5 KiB
Go
// Copyright (c) 2013-2015 The btcsuite developers
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// Use of this source code is governed by an ISC
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// license that can be found in the LICENSE file.
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package btcutil
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import (
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"bytes"
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"crypto/ecdsa"
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"crypto/elliptic"
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"crypto/rand"
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_ "crypto/sha512" // Needed for RegisterHash in init
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"crypto/x509"
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"crypto/x509/pkix"
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"encoding/pem"
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"errors"
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"fmt"
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"math/big"
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"net"
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"os"
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"time"
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)
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// NewTLSCertPair returns a new PEM-encoded x.509 certificate pair
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// based on a 521-bit ECDSA private key. The machine's local interface
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// addresses and all variants of IPv4 and IPv6 localhost are included as
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// valid IP addresses.
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func NewTLSCertPair(organization string, validUntil time.Time, extraHosts []string) (cert, key []byte, err error) {
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now := time.Now()
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if validUntil.Before(now) {
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return nil, nil, errors.New("validUntil would create an already-expired certificate")
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}
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priv, err := ecdsa.GenerateKey(elliptic.P521(), rand.Reader)
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if err != nil {
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return nil, nil, err
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}
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// end of ASN.1 time
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endOfTime := time.Date(2049, 12, 31, 23, 59, 59, 0, time.UTC)
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if validUntil.After(endOfTime) {
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validUntil = endOfTime
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}
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serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
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serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
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if err != nil {
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return nil, nil, fmt.Errorf("failed to generate serial number: %s", err)
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}
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host, err := os.Hostname()
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if err != nil {
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return nil, nil, err
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}
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ipAddresses := []net.IP{net.ParseIP("127.0.0.1"), net.ParseIP("::1")}
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dnsNames := []string{host}
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if host != "localhost" {
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dnsNames = append(dnsNames, "localhost")
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}
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addIP := func(ipAddr net.IP) {
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for _, ip := range ipAddresses {
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if bytes.Equal(ip, ipAddr) {
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return
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}
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}
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ipAddresses = append(ipAddresses, ipAddr)
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}
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addHost := func(host string) {
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for _, dnsName := range dnsNames {
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if host == dnsName {
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return
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}
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}
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dnsNames = append(dnsNames, host)
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}
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addrs, err := interfaceAddrs()
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if err != nil {
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return nil, nil, err
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}
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for _, a := range addrs {
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ipAddr, _, err := net.ParseCIDR(a.String())
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if err == nil {
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addIP(ipAddr)
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}
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}
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for _, hostStr := range extraHosts {
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host, _, err := net.SplitHostPort(hostStr)
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if err != nil {
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host = hostStr
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}
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if ip := net.ParseIP(host); ip != nil {
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addIP(ip)
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} else {
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addHost(host)
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}
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}
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template := x509.Certificate{
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SerialNumber: serialNumber,
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Subject: pkix.Name{
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Organization: []string{organization},
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CommonName: host,
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},
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NotBefore: now.Add(-time.Hour * 24),
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NotAfter: validUntil,
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KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature |
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x509.KeyUsageCertSign,
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IsCA: true, // so can sign self.
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BasicConstraintsValid: true,
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DNSNames: dnsNames,
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IPAddresses: ipAddresses,
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}
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derBytes, err := x509.CreateCertificate(rand.Reader, &template,
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&template, &priv.PublicKey, priv)
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if err != nil {
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return nil, nil, fmt.Errorf("failed to create certificate: %v", err)
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}
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certBuf := &bytes.Buffer{}
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err = pem.Encode(certBuf, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
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if err != nil {
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return nil, nil, fmt.Errorf("failed to encode certificate: %v", err)
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}
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keybytes, err := x509.MarshalECPrivateKey(priv)
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if err != nil {
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return nil, nil, fmt.Errorf("failed to marshal private key: %v", err)
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}
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keyBuf := &bytes.Buffer{}
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err = pem.Encode(keyBuf, &pem.Block{Type: "EC PRIVATE KEY", Bytes: keybytes})
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if err != nil {
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return nil, nil, fmt.Errorf("failed to encode private key: %v", err)
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}
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return certBuf.Bytes(), keyBuf.Bytes(), nil
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}
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