81 lines
2.5 KiB
Go
81 lines
2.5 KiB
Go
// Copyright 2019 Sorint.lab
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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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package util
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import (
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"bytes"
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"crypto/rand"
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"crypto/rsa"
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"crypto/x509"
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"encoding/pem"
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"agola.io/agola/internal/errors"
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"golang.org/x/crypto/ssh"
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)
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// GenSSHKeyPair generate an ssh keypair in rsa format, returning the private
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// key (in pem encoding) and the public key (in the OpenSSH base64 format)
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func GenSSHKeyPair(bits int) ([]byte, []byte, error) {
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privateKey, err := rsa.GenerateKey(rand.Reader, bits)
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if err != nil {
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return nil, nil, errors.WithStack(err)
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}
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err = privateKey.Validate()
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if err != nil {
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return nil, nil, errors.WithStack(err)
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}
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privateKeyPEM := &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(privateKey)}
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var privateBuf bytes.Buffer
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if err := pem.Encode(&privateBuf, privateKeyPEM); err != nil {
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return nil, nil, errors.New("failed to pem encode private key")
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}
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pub, err := ssh.NewPublicKey(&privateKey.PublicKey)
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if err != nil {
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return nil, nil, errors.New("failed to generate public key")
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}
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// remove trailing \n returned by ssh.MarshalAuthorizedKey
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return privateBuf.Bytes(), bytes.TrimSuffix(ssh.MarshalAuthorizedKey(pub), []byte("\n")), nil
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}
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// ExtraxtPublicKey extracts the public key from a ssh private key in pem format
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func ExtractPublicKey(privateKeyPEM []byte) ([]byte, error) {
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block, _ := pem.Decode(privateKeyPEM)
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if block == nil || block.Type != "RSA PRIVATE KEY" {
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return nil, errors.New("failed to decode PEM block containing rsa private key")
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}
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privateKey, err := x509.ParsePKCS1PrivateKey(block.Bytes)
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if err != nil {
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return nil, errors.New("failed to parse rsa private key")
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}
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err = privateKey.Validate()
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if err != nil {
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return nil, errors.New("failed to validate rsa private key")
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}
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pub, err := ssh.NewPublicKey(&privateKey.PublicKey)
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if err != nil {
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return nil, errors.New("failed to generate public key")
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}
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// remove trailing \n returned by ssh.MarshalAuthorizedKey
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return bytes.TrimSuffix(ssh.MarshalAuthorizedKey(pub), []byte("\n")), nil
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}
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