certificates/ca/identity.go

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package ca
import (
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"bytes"
"crypto"
"crypto/tls"
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"crypto/x509"
"encoding/json"
"encoding/pem"
"io/ioutil"
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"net/http"
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"os"
"path/filepath"
"strings"
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"time"
"github.com/pkg/errors"
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"github.com/smallstep/certificates/api"
"github.com/smallstep/cli/config"
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"github.com/smallstep/cli/crypto/pemutil"
)
// IdentityType represents the different types of identity files.
type IdentityType string
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// DisableIdentity is a global variable to disable the identity.
var DisableIdentity bool = false
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// Disabled represents a disabled identity type
const Disabled IdentityType = ""
// MutualTLS represents the identity using mTLS
const MutualTLS IdentityType = "mTLS"
// IdentityFile contains the location of the identity file.
var IdentityFile = filepath.Join(config.StepPath(), "config", "identity.json")
// Identity represents the identity file that can be used to authenticate with
// the CA.
type Identity struct {
Type string `json:"type"`
Certificate string `json:"crt"`
Key string `json:"key"`
}
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// NewIdentityRequest returns a new CSR to create the identity. If an identity
// was already present it reuses the private key.
func NewIdentityRequest(commonName string, sans ...string) (*api.CertificateRequest, crypto.PrivateKey, error) {
var identityKey crypto.PrivateKey
if i, err := LoadDefaultIdentity(); err == nil && i.Key != "" {
if k, err := pemutil.Read(i.Key); err == nil {
identityKey = k
}
}
if identityKey == nil {
return CreateCertificateRequest(commonName, sans...)
}
return createCertificateRequest(commonName, sans, identityKey)
}
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// LoadDefaultIdentity loads the default identity.
func LoadDefaultIdentity() (*Identity, error) {
b, err := ioutil.ReadFile(IdentityFile)
if err != nil {
return nil, errors.Wrap(err, "error reading identity json")
}
identity := new(Identity)
if err := json.Unmarshal(b, &identity); err != nil {
return nil, errors.Wrapf(err, "error unmarshaling %s", IdentityFile)
}
return identity, nil
}
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// WriteDefaultIdentity writes the given certificates and key and the
// identity.json pointing to the new files.
func WriteDefaultIdentity(certChain []api.Certificate, key crypto.PrivateKey) error {
base := filepath.Join(config.StepPath(), "config")
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if err := os.MkdirAll(base, 0700); err != nil {
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return errors.Wrap(err, "error creating config directory")
}
base = filepath.Join(config.StepPath(), "identity")
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if err := os.MkdirAll(base, 0700); err != nil {
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return errors.Wrap(err, "error creating identity directory")
}
certFilename := filepath.Join(base, "identity.crt")
keyFilename := filepath.Join(base, "identity_key")
// Write certificate
buf := new(bytes.Buffer)
for _, crt := range certChain {
block := &pem.Block{
Type: "CERTIFICATE",
Bytes: crt.Raw,
}
if err := pem.Encode(buf, block); err != nil {
return errors.Wrap(err, "error encoding identity certificate")
}
}
if err := ioutil.WriteFile(certFilename, buf.Bytes(), 0600); err != nil {
return errors.Wrap(err, "error writing identity certificate")
}
// Write key
buf.Reset()
block, err := pemutil.Serialize(key)
if err != nil {
return err
}
if err := pem.Encode(buf, block); err != nil {
return errors.Wrap(err, "error encoding identity key")
}
if err := ioutil.WriteFile(keyFilename, buf.Bytes(), 0600); err != nil {
return errors.Wrap(err, "error writing identity certificate")
}
// Write identity.json
buf.Reset()
enc := json.NewEncoder(buf)
enc.SetIndent("", " ")
if err := enc.Encode(Identity{
Type: string(MutualTLS),
Certificate: certFilename,
Key: keyFilename,
}); err != nil {
return errors.Wrap(err, "error writing identity json")
}
if err := ioutil.WriteFile(IdentityFile, buf.Bytes(), 0600); err != nil {
return errors.Wrap(err, "error writing identity certificate")
}
return nil
}
// Kind returns the type for the given identity.
func (i *Identity) Kind() IdentityType {
switch strings.ToLower(i.Type) {
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case "":
return Disabled
case "mtls":
return MutualTLS
default:
return IdentityType(i.Type)
}
}
// Validate validates the identity object.
func (i *Identity) Validate() error {
switch i.Kind() {
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case Disabled:
return nil
case MutualTLS:
if i.Certificate == "" {
return errors.New("identity.crt cannot be empty")
}
if i.Key == "" {
return errors.New("identity.key cannot be empty")
}
return nil
default:
return errors.Errorf("unsupported identity type %s", i.Type)
}
}
// Options returns the ClientOptions used for the given identity.
func (i *Identity) Options() ([]ClientOption, error) {
switch i.Kind() {
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case Disabled:
return nil, nil
case MutualTLS:
crt, err := tls.LoadX509KeyPair(i.Certificate, i.Key)
if err != nil {
return nil, errors.Wrap(err, "error creating identity certificate")
}
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// Check if certificate is expired.
// Do not return any options if expired.
x509Cert, err := x509.ParseCertificate(crt.Certificate[0])
if err != nil {
return nil, errors.Wrap(err, "error creating identity certificate")
}
now := time.Now()
if now.Before(x509Cert.NotBefore) || now.After(x509Cert.NotAfter) {
return nil, nil
}
return []ClientOption{WithCertificate(crt)}, nil
default:
return nil, errors.Errorf("unsupported identity type %s", i.Type)
}
}
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// Renew renews the identity certificate using the given client.
func (i *Identity) Renew(client *Client) error {
switch i.Kind() {
case Disabled:
return nil
case MutualTLS:
cert, err := tls.LoadX509KeyPair(i.Certificate, i.Key)
if err != nil {
return errors.Wrap(err, "error creating identity certificate")
}
tr := &http.Transport{
TLSClientConfig: &tls.Config{
Certificates: []tls.Certificate{cert},
RootCAs: client.GetRootCAs(),
PreferServerCipherSuites: true,
},
}
resp, err := client.Renew(tr)
if err != nil {
return err
}
buf := new(bytes.Buffer)
for _, crt := range resp.CertChainPEM {
block := &pem.Block{
Type: "CERTIFICATE",
Bytes: crt.Raw,
}
if err := pem.Encode(buf, block); err != nil {
return errors.Wrap(err, "error encoding identity certificate")
}
}
if err := ioutil.WriteFile(i.Certificate, buf.Bytes(), 0600); err != nil {
return errors.Wrap(err, "error writing identity certificate")
}
return nil
default:
return errors.Errorf("unsupported identity type %s", i.Type)
}
}