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aws_ssh_key.go
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aws_ssh_key.go
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package aws_ssh_key
import (
"crypto/x509"
"encoding/pem"
"fmt"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/credentials"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/ec2"
"github.com/michaelquigley/pfxlog"
"github.com/openziti/fablab/kernel/model"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"golang.org/x/crypto/ssh"
"os"
"path"
)
var KeyManager = awsKeyManager{}
func Express() model.Stage {
return KeyManager
}
type awsKeyManager struct{}
func (l awsKeyManager) Bootstrap(m *model.Model) error {
if !m.HasVariable("credentials.aws.ssh_key_name") {
environment := m.MustStringVariable("environment")
instanceId := model.ActiveInstanceId()
keyName := fmt.Sprintf("%v-%v", environment, instanceId)
m.PutVariable("credentials.aws.ssh_key_name", keyName)
}
if m.HasVariable("credentials.ssh.key_path") {
return nil
}
keyPath := path.Join(model.BuildPath(), "ssh_private_key.pem")
m.PutVariable("credentials.ssh.key_path", keyPath)
return nil
}
func (stage awsKeyManager) Execute(run model.Run) error {
m := run.GetModel()
if managedKey, found := m.GetBoolVariable("credentials.aws.managed_key"); !found || !managedKey {
if !found {
logrus.Info("credentials.aws.managed_key setting not found. skipping managed key setup")
} else if !managedKey {
logrus.Info("credentials.aws.managed_key setting set to false. skipping managed key setup")
}
return nil
}
logrus.Info("beginning managed key setup")
keyName, found := m.GetStringVariable("credentials.aws.ssh_key_name")
if !found {
keyName = m.MustStringVariable("environment")
}
awsAccessKey := m.MustStringVariable("credentials.aws.access_key")
awsSecretKey := m.MustStringVariable("credentials.aws.secret_key")
awsCreds := credentials.NewStaticCredentials(awsAccessKey, awsSecretKey, "")
var privateKey []byte
var publicKey []byte
keyPath := m.MustStringVariable("credentials.ssh.key_path")
logrus.Infof("checking for private key in %v", keyPath)
var err error
if privateKey, err = os.ReadFile(keyPath); err == nil {
logrus.Infof("loaded private key from %v... deriving public key", keyPath)
publicKey, err = getPublicKey(privateKey)
if err != nil {
return err
}
} else {
logrus.Infof("failed to load private key from %v (%v), generating new key", keyPath, err)
for _, region := range m.Regions {
awsConfig := &aws.Config{
Credentials: awsCreds,
Region: ®ion.Region,
}
awsSession, err := session.NewSession(awsConfig)
if err != nil {
return err
}
ec2Client := ec2.New(awsSession)
_, err = ec2Client.DescribeKeyPairs(&ec2.DescribeKeyPairsInput{
KeyNames: []*string{&keyName},
})
if err == nil {
logrus.Infof("removing key %v from region %v, as we don't have the private key anymore", keyPath, region.Region)
if _, err = ec2Client.DeleteKeyPair(&ec2.DeleteKeyPairInput{KeyName: &keyName}); err != nil {
return errors.Wrapf(err, "failed to remove private key %v from region %v", keyName, region.Region)
}
}
}
}
for _, region := range m.Regions {
awsConfig := &aws.Config{
Credentials: awsCreds,
Region: ®ion.Region,
}
awsSession, err := session.NewSession(awsConfig)
if err != nil {
return err
}
ec2Client := ec2.New(awsSession)
_, err = ec2Client.DescribeKeyPairs(&ec2.DescribeKeyPairsInput{
KeyNames: []*string{&keyName},
})
if err == nil {
logrus.Infof("key pair %v already exists in region %v. skipping create/import", keyName, region.Region)
continue
}
if publicKey == nil {
logrus.Infof("creating key '%v' in region %v", keyName, region.Region)
keyPairInput := &ec2.CreateKeyPairInput{KeyName: &keyName}
output, err := ec2Client.CreateKeyPair(keyPairInput)
if err != nil {
return err
}
privateKey = []byte(*output.KeyMaterial)
publicKey, err = getPublicKey(privateKey)
if err != nil {
return err
}
keyPath := m.MustStringVariable("credentials.ssh.key_path")
logrus.Infof("saving private key '%v' to %v", keyName, keyPath)
if err = os.WriteFile(keyPath, privateKey, 0600); err != nil {
return err
}
} else {
logrus.Infof("importing key '%v' in region %v", keyName, region.Region)
keyPairInput := &ec2.ImportKeyPairInput{
KeyName: &keyName,
PublicKeyMaterial: publicKey,
}
if _, err := ec2Client.ImportKeyPair(keyPairInput); err != nil {
return err
}
}
}
return nil
}
func getPublicKey(privateKey []byte) ([]byte, error) {
block, _ := pem.Decode(privateKey)
if block != nil && block.Type == "RSA PRIVATE KEY" {
key, err := x509.ParsePKCS1PrivateKey(block.Bytes)
if err != nil {
return nil, err
}
publicKey, err := ssh.NewPublicKey(&key.PublicKey)
if err != nil {
return nil, err
}
return ssh.MarshalAuthorizedKey(publicKey), nil
}
if block != nil && block.Type == "OPENSSH PRIVATE KEY" {
key, err := ssh.ParsePrivateKey(privateKey)
if err != nil {
pfxlog.Logger().Errorf("error parsing PK (%v)", err)
return nil, err
}
return ssh.MarshalAuthorizedKey(key.PublicKey()), nil
}
return nil, errors.Errorf("failed to decode PEM block containing public key")
}