mirror of
https://github.com/gravitational/teleport.git
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121 lines
3.6 KiB
Go
121 lines
3.6 KiB
Go
/*
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* Teleport
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* Copyright (C) 2023 Gravitational, Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package cert
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import (
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"crypto"
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"crypto/ecdsa"
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"crypto/elliptic"
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"crypto/rand"
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"time"
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"github.com/gravitational/trace"
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"golang.org/x/crypto/ssh"
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"github.com/gravitational/teleport/lib/auth/native"
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)
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// CreateCertificate creates a valid 2048-bit RSA certificate.
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func CreateCertificate(principal string, certType uint32) (*ssh.Certificate, ssh.Signer, error) {
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// Create RSA key for CA and certificate to be signed by CA.
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caKey, err := native.GenerateRSAPrivateKey()
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if err != nil {
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return nil, nil, trace.Wrap(err)
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}
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key, err := native.GenerateRSAPrivateKey()
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if err != nil {
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return nil, nil, trace.Wrap(err)
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}
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cert, certSigner, err := createCertificate(principal, certType, caKey, key)
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if err != nil {
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return nil, nil, trace.Wrap(err)
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}
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return cert, certSigner, nil
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}
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// CreateEllipticCertificate creates a valid, but not supported, ECDSA
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// SSH certificate. This certificate is used to make sure Teleport rejects
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// such certificates.
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func CreateEllipticCertificate(principal string, certType uint32) (*ssh.Certificate, ssh.Signer, error) {
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// Create ECDSA key for CA and certificate to be signed by CA.
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caKey, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
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if err != nil {
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return nil, nil, trace.Wrap(err)
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}
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key, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
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if err != nil {
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return nil, nil, trace.Wrap(err)
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}
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cert, certSigner, err := createCertificate(principal, certType, caKey, key)
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if err != nil {
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return nil, nil, trace.Wrap(err)
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}
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return cert, certSigner, nil
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}
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// createCertificate creates a SSH certificate for the given key signed by the
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// given CA key. This function exists here to allow easy key generation for
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// some of the more core packages like "sshutils".
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func createCertificate(principal string, certType uint32, caKey crypto.Signer, key crypto.Signer) (*ssh.Certificate, ssh.Signer, error) {
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// Create CA.
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caPublicKey, err := ssh.NewPublicKey(caKey.Public())
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if err != nil {
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return nil, nil, trace.Wrap(err)
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}
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caSigner, err := ssh.NewSignerFromKey(caKey)
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if err != nil {
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return nil, nil, trace.Wrap(err)
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}
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// Create key.
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publicKey, err := ssh.NewPublicKey(key.Public())
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if err != nil {
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return nil, nil, trace.Wrap(err)
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}
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keySigner, err := ssh.NewSignerFromKey(key)
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if err != nil {
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return nil, nil, trace.Wrap(err)
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}
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// Create certificate and signer.
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cert := &ssh.Certificate{
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KeyId: principal,
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ValidPrincipals: []string{principal},
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Key: publicKey,
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SignatureKey: caPublicKey,
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ValidAfter: uint64(time.Now().UTC().Add(-1 * time.Minute).Unix()),
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ValidBefore: uint64(time.Now().UTC().Add(1 * time.Minute).Unix()),
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CertType: certType,
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}
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err = cert.SignCert(rand.Reader, caSigner)
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if err != nil {
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return nil, nil, trace.Wrap(err)
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}
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certSigner, err := ssh.NewCertSigner(cert, keySigner)
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if err != nil {
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return nil, nil, trace.Wrap(err)
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}
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return cert, certSigner, nil
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}
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