mirror of
https://github.com/gravitational/teleport.git
synced 2026-09-24 16:17:11 +08:00
120 lines
3.5 KiB
Go
120 lines
3.5 KiB
Go
/*
|
|
Copyright 2019 Gravitational, Inc.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package utils
|
|
|
|
import (
|
|
"crypto"
|
|
"crypto/ecdsa"
|
|
"crypto/elliptic"
|
|
"crypto/rand"
|
|
"crypto/rsa"
|
|
"time"
|
|
|
|
"github.com/gravitational/teleport/api/constants"
|
|
|
|
"github.com/gravitational/trace"
|
|
"golang.org/x/crypto/ssh"
|
|
)
|
|
|
|
// CreateCertificate creates a valid 2048-bit RSA certificate.
|
|
func CreateCertificate(principal string, certType uint32) (*ssh.Certificate, ssh.Signer, error) {
|
|
// Create RSA key for CA and certificate to be signed by CA.
|
|
caKey, err := rsa.GenerateKey(rand.Reader, constants.RSAKeySize)
|
|
if err != nil {
|
|
return nil, nil, trace.Wrap(err)
|
|
}
|
|
key, err := rsa.GenerateKey(rand.Reader, constants.RSAKeySize)
|
|
if err != nil {
|
|
return nil, nil, trace.Wrap(err)
|
|
}
|
|
|
|
cert, certSigner, err := createCertificate(principal, certType, caKey, key)
|
|
if err != nil {
|
|
return nil, nil, trace.Wrap(err)
|
|
}
|
|
|
|
return cert, certSigner, nil
|
|
}
|
|
|
|
// CreateEllipticCertificate creates a valid, but not supported, ECDSA
|
|
// SSH certificate. This certificate is used to make sure Teleport rejects
|
|
// such certificates.
|
|
func CreateEllipticCertificate(principal string, certType uint32) (*ssh.Certificate, ssh.Signer, error) {
|
|
// Create ECDSA key for CA and certificate to be signed by CA.
|
|
caKey, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
|
|
if err != nil {
|
|
return nil, nil, trace.Wrap(err)
|
|
}
|
|
key, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
|
|
if err != nil {
|
|
return nil, nil, trace.Wrap(err)
|
|
}
|
|
|
|
cert, certSigner, err := createCertificate(principal, certType, caKey, key)
|
|
if err != nil {
|
|
return nil, nil, trace.Wrap(err)
|
|
}
|
|
|
|
return cert, certSigner, nil
|
|
}
|
|
|
|
// createCertificate creates a SSH certificate for the given key signed by the
|
|
// given CA key. This function exists here to allow easy key generation for
|
|
// some of the more core packages like "sshutils".
|
|
func createCertificate(principal string, certType uint32, caKey crypto.Signer, key crypto.Signer) (*ssh.Certificate, ssh.Signer, error) {
|
|
// Create CA.
|
|
caPublicKey, err := ssh.NewPublicKey(caKey.Public())
|
|
if err != nil {
|
|
return nil, nil, trace.Wrap(err)
|
|
}
|
|
caSigner, err := ssh.NewSignerFromKey(caKey)
|
|
if err != nil {
|
|
return nil, nil, trace.Wrap(err)
|
|
}
|
|
|
|
// Create key.
|
|
publicKey, err := ssh.NewPublicKey(key.Public())
|
|
if err != nil {
|
|
return nil, nil, trace.Wrap(err)
|
|
}
|
|
keySigner, err := ssh.NewSignerFromKey(key)
|
|
if err != nil {
|
|
return nil, nil, trace.Wrap(err)
|
|
}
|
|
|
|
// Create certificate and signer.
|
|
cert := &ssh.Certificate{
|
|
KeyId: principal,
|
|
ValidPrincipals: []string{principal},
|
|
Key: publicKey,
|
|
SignatureKey: caPublicKey,
|
|
ValidAfter: uint64(time.Now().UTC().Add(-1 * time.Minute).Unix()),
|
|
ValidBefore: uint64(time.Now().UTC().Add(1 * time.Minute).Unix()),
|
|
CertType: certType,
|
|
}
|
|
err = cert.SignCert(rand.Reader, caSigner)
|
|
if err != nil {
|
|
return nil, nil, trace.Wrap(err)
|
|
}
|
|
certSigner, err := ssh.NewCertSigner(cert, keySigner)
|
|
if err != nil {
|
|
return nil, nil, trace.Wrap(err)
|
|
}
|
|
|
|
return cert, certSigner, nil
|
|
}
|