forked from kubernetes/kops
/
sshkey.go
250 lines (205 loc) · 6.57 KB
/
sshkey.go
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package awstasks
import (
"bytes"
"crypto"
"crypto/md5"
"crypto/rsa"
"crypto/x509"
"encoding/base64"
"fmt"
"reflect"
"strings"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/service/ec2"
"github.com/golang/glog"
"golang.org/x/crypto/ssh"
"k8s.io/kops/upup/pkg/fi"
"k8s.io/kops/upup/pkg/fi/cloudup/awsup"
"k8s.io/kops/upup/pkg/fi/cloudup/terraform"
"k8s.io/kops/upup/pkg/fi/utils"
)
//go:generate fitask -type=SSHKey
type SSHKey struct {
Name *string
PublicKey *fi.ResourceHolder
KeyFingerprint *string
}
var _ fi.CompareWithID = &SSHKey{}
func (e *SSHKey) CompareWithID() *string {
return e.Name
}
func (e *SSHKey) Find(c *fi.Context) (*SSHKey, error) {
cloud := c.Cloud.(awsup.AWSCloud)
request := &ec2.DescribeKeyPairsInput{
KeyNames: []*string{e.Name},
}
response, err := cloud.EC2().DescribeKeyPairs(request)
if awsErr, ok := err.(awserr.Error); ok {
if awsErr.Code() == "InvalidKeyPair.NotFound" {
return nil, nil
}
}
if err != nil {
return nil, fmt.Errorf("error listing SSHKeys: %v", err)
}
if response == nil || len(response.KeyPairs) == 0 {
return nil, nil
}
if len(response.KeyPairs) != 1 {
return nil, fmt.Errorf("Found multiple SSHKeys with Name %q", *e.Name)
}
k := response.KeyPairs[0]
actual := &SSHKey{
Name: k.KeyName,
KeyFingerprint: k.KeyFingerprint,
}
// Avoid spurious changes
if fi.StringValue(actual.KeyFingerprint) == fi.StringValue(e.KeyFingerprint) {
glog.V(2).Infof("SSH key fingerprints match; assuming public keys match")
actual.PublicKey = e.PublicKey
} else {
glog.V(2).Infof("Computed SSH key fingerprint mismatch: %q %q", fi.StringValue(e.KeyFingerprint), fi.StringValue(actual.KeyFingerprint))
}
return actual, nil
}
// parseSSHPublicKey parses the SSH public key string
func parseSSHPublicKey(publicKey string) (ssh.PublicKey, error) {
tokens := strings.Fields(publicKey)
if len(tokens) < 2 {
return nil, fmt.Errorf("error parsing SSH public key: %q", publicKey)
}
sshPublicKeyBytes, err := base64.StdEncoding.DecodeString(tokens[1])
if len(tokens) < 2 {
return nil, fmt.Errorf("error decoding SSH public key: %q", publicKey)
}
sshPublicKey, err := ssh.ParsePublicKey(sshPublicKeyBytes)
if err != nil {
return nil, fmt.Errorf("error parsing SSH public key: %v", err)
}
return sshPublicKey, nil
}
// colonSeparatedHex formats the byte slice SSH-fingerprint style: hex bytes separated by colons
func colonSeparatedHex(data []byte) string {
sshKeyFingerprint := fmt.Sprintf("%x", data)
var colonSeparated bytes.Buffer
for i := 0; i < len(sshKeyFingerprint); i++ {
if (i%2) == 0 && i != 0 {
colonSeparated.WriteByte(':')
}
colonSeparated.WriteByte(sshKeyFingerprint[i])
}
return colonSeparated.String()
}
// computeAWSKeyFingerprint computes the AWS-specific fingerprint of the SSH public key
func computeAWSKeyFingerprint(publicKey string) (string, error) {
sshPublicKey, err := parseSSHPublicKey(publicKey)
if err != nil {
return "", err
}
der, err := toDER(sshPublicKey)
if err != nil {
return "", fmt.Errorf("error computing fingerprint for SSH public key: %v", err)
}
h := md5.Sum(der)
return colonSeparatedHex(h[:]), nil
}
// ComputeOpenSSHKeyFingerprint computes the OpenSSH fingerprint of the SSH public key
func ComputeOpenSSHKeyFingerprint(publicKey string) (string, error) {
sshPublicKey, err := parseSSHPublicKey(publicKey)
if err != nil {
return "", err
}
h := md5.Sum(sshPublicKey.Marshal())
return colonSeparatedHex(h[:]), nil
}
// toDER gets the DER encoding of the SSH public key
// Annoyingly, the ssh code wraps the actual crypto keys, so we have to use reflection tricks
func toDER(pubkey ssh.PublicKey) ([]byte, error) {
pubkeyValue := reflect.ValueOf(pubkey)
typeName := utils.BuildTypeName(pubkeyValue.Type())
var cryptoKey crypto.PublicKey
switch typeName {
case "*rsaPublicKey":
var rsaPublicKey *rsa.PublicKey
targetType := reflect.ValueOf(rsaPublicKey).Type()
rsaPublicKey = pubkeyValue.Convert(targetType).Interface().(*rsa.PublicKey)
cryptoKey = rsaPublicKey
//case "*dsaPublicKey":
// var dsaPublicKey *dsa.PublicKey
// targetType := reflect.ValueOf(dsaPublicKey).Type()
// dsaPublicKey = pubkeyValue.Convert(targetType).Interface().(*dsa.PublicKey)
// cryptoKey = dsaPublicKey
default:
return nil, fmt.Errorf("Unexpected type of SSH key (%q); AWS can only import RSA keys", typeName)
}
der, err := x509.MarshalPKIXPublicKey(cryptoKey)
if err != nil {
return nil, fmt.Errorf("error marshalling SSH public key: %v", err)
}
return der, nil
}
func (e *SSHKey) Run(c *fi.Context) error {
if e.KeyFingerprint == nil && e.PublicKey != nil {
publicKey, err := e.PublicKey.AsString()
if err != nil {
return fmt.Errorf("error reading SSH public key: %v", err)
}
keyFingerprint, err := computeAWSKeyFingerprint(publicKey)
if err != nil {
return fmt.Errorf("error computing key fingerprint for SSH key: %v", err)
}
glog.V(2).Infof("Computed SSH key fingerprint as %q", keyFingerprint)
e.KeyFingerprint = &keyFingerprint
}
return fi.DefaultDeltaRunMethod(e, c)
}
func (s *SSHKey) CheckChanges(a, e, changes *SSHKey) error {
if a != nil {
if changes.Name != nil {
return fi.CannotChangeField("Name")
}
}
return nil
}
func (_ *SSHKey) RenderAWS(t *awsup.AWSAPITarget, a, e, changes *SSHKey) error {
if a == nil {
glog.V(2).Infof("Creating SSHKey with Name:%q", *e.Name)
request := &ec2.ImportKeyPairInput{
KeyName: e.Name,
}
if e.PublicKey != nil {
d, err := e.PublicKey.AsBytes()
if err != nil {
return fmt.Errorf("error rendering SSHKey PublicKey: %v", err)
}
request.PublicKeyMaterial = d
}
response, err := t.Cloud.EC2().ImportKeyPair(request)
if err != nil {
return fmt.Errorf("error creating SSHKey: %v", err)
}
e.KeyFingerprint = response.KeyFingerprint
}
// No tags on SSH public key
return nil //return output.AddAWSTags(cloud.Tags(), v, "vpc")
}
type terraformSSHKey struct {
Name *string `json:"key_name"`
PublicKey *terraform.Literal `json:"public_key"`
}
func (_ *SSHKey) RenderTerraform(t *terraform.TerraformTarget, a, e, changes *SSHKey) error {
tfName := strings.Replace(*e.Name, ":", "", -1)
publicKey, err := t.AddFile("aws_key_pair", tfName, "public_key", e.PublicKey)
if err != nil {
return fmt.Errorf("error rendering PublicKey: %v", err)
}
tf := &terraformSSHKey{
Name: e.Name,
PublicKey: publicKey,
}
return t.RenderResource("aws_key_pair", tfName, tf)
}
func (e *SSHKey) TerraformLink() *terraform.Literal {
tfName := strings.Replace(*e.Name, ":", "", -1)
return terraform.LiteralProperty("aws_key_pair", tfName, "id")
}