mirror of
https://github.com/gravitational/teleport.git
synced 2026-10-12 02:15:01 +00:00
124 lines
3.8 KiB
Go
124 lines
3.8 KiB
Go
/*
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*
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* Copyright 2022 Gravitational, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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package cert
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import (
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"crypto/rand"
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"crypto/x509"
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"crypto/x509/pkix"
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"encoding/pem"
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"math/big"
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"net"
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"time"
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"github.com/gravitational/trace"
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"github.com/sirupsen/logrus"
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"github.com/gravitational/teleport/lib/auth/native"
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)
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// macMaxTLSCertValidityPeriod is the maximum validity period
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// for a TLS certificate enforced by macOS.
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// As of Go 1.18, certificates are validated via the system
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// verifier and not in Go.
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const macMaxTLSCertValidityPeriod = 825 * 24 * time.Hour
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// Credentials keeps the typical 3 components of a proper TLS configuration
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type Credentials struct {
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// PublicKey in PEM format
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PublicKey []byte
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// PrivateKey in PEM format
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PrivateKey []byte
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Cert []byte
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}
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// GenerateSelfSignedCert generates a self-signed certificate that
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// is valid for given domain names and IPs. If extended key usage
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// is not specified, the cert will be generated for server auth.
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func GenerateSelfSignedCert(hostNames []string, ipAddresses []string, eku ...x509.ExtKeyUsage) (*Credentials, error) {
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if len(eku) == 0 {
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// if not specified, assume this cert is for server auth,
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// which is required for validation on macOS:
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// https://support.apple.com/en-in/HT210176
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eku = []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth}
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}
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priv, err := native.GenerateRSAPrivateKey()
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if err != nil {
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return nil, trace.Wrap(err)
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}
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notBefore := time.Now()
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notAfter := notBefore.Add(macMaxTLSCertValidityPeriod)
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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, trace.Wrap(err)
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}
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entity := pkix.Name{
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CommonName: "localhost",
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Country: []string{"US"},
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Organization: []string{"localhost"},
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}
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template := x509.Certificate{
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SerialNumber: serialNumber,
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Issuer: entity,
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Subject: entity,
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NotBefore: notBefore,
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NotAfter: notAfter,
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KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign,
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ExtKeyUsage: eku,
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BasicConstraintsValid: true,
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IsCA: true,
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}
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// collect IP addresses localhost resolves to and add them to the cert. template:
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template.DNSNames = append(hostNames, "localhost.local")
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ips, _ := net.LookupIP("localhost")
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if ips != nil {
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template.IPAddresses = append(ips, net.ParseIP("::1"))
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}
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for _, ip := range ipAddresses {
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ipParsed := net.ParseIP(ip)
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if ipParsed == nil {
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return nil, trace.Errorf("Unable to parse IP address for self-signed certificate (%v)", ip)
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}
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template.IPAddresses = append(template.IPAddresses, ipParsed)
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}
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derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, &priv.PublicKey, priv)
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if err != nil {
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return nil, trace.Wrap(err)
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}
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publicKeyBytes, err := x509.MarshalPKIXPublicKey(priv.Public())
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if err != nil {
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logrus.Error(err)
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return nil, trace.Wrap(err)
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}
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return &Credentials{
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PublicKey: pem.EncodeToMemory(&pem.Block{Type: "RSA PUBLIC KEY", Bytes: publicKeyBytes}),
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PrivateKey: pem.EncodeToMemory(&pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(priv)}),
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Cert: pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: derBytes}),
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}, nil
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}
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