mirror of
https://github.com/gravitational/teleport.git
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79 lines
2.5 KiB
Go
79 lines
2.5 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 sshutils
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import (
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"crypto"
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"io"
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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/api/utils/sshutils"
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)
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// LegacySHA1Signer always forces use of SHA-1 for signing. It should be not
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// be used until necessary.
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// This struct should not implement SignWithAlgorithm() method
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// from ssh.AlgorithmSigner interface. This would break the SHA-1 signing.
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type LegacySHA1Signer struct {
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Signer ssh.AlgorithmSigner
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}
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// PublicKey returns the public key from the underlying signer.
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func (s *LegacySHA1Signer) PublicKey() ssh.PublicKey {
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return s.Signer.PublicKey()
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}
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// Sign forces the SHA-1 signature.
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func (s *LegacySHA1Signer) Sign(rand io.Reader, data []byte) (*ssh.Signature, error) {
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return s.Signer.SignWithAlgorithm(rand, data, ssh.KeyAlgoRSA)
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}
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// NewSigner returns new ssh Signer from private key + certificate pair. The
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// signer can be used to create "auth methods" i.e. login into Teleport SSH
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// servers.
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func NewSigner(keyBytes, certBytes []byte) (ssh.Signer, error) {
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keySigner, err := ssh.ParsePrivateKey(keyBytes)
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if err != nil {
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return nil, trace.Wrap(err, "failed to parse SSH private key")
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}
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cert, err := sshutils.ParseCertificate(certBytes)
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if err != nil {
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return nil, trace.Wrap(err, "failed to parse SSH certificate")
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}
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return ssh.NewCertSigner(cert, keySigner)
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}
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// CryptoPublicKey extracts public key from RSA public key in authorized_keys format
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func CryptoPublicKey(publicKey []byte) (crypto.PublicKey, error) {
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// reuse the same RSA keys for SSH and TLS keys
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pubKey, _, _, _, err := ssh.ParseAuthorizedKey(publicKey)
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if err != nil {
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return nil, trace.Wrap(err)
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}
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cryptoPubKey, ok := pubKey.(ssh.CryptoPublicKey)
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if !ok {
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return nil, trace.BadParameter("expected ssh.CryptoPublicKey, got %T", pubKey)
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}
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return cryptoPubKey.CryptoPublicKey(), nil
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}
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