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Cleanup Vault CAS integration

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pull/894/head
Mariano Cano 2 years ago
parent 9134bad22c
commit 967d9136ca
2 changed files with 180 additions and 240 deletions
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401
cas/vaultcas/vaultcas.go
Unescape Escape View File

@ -1,12 +1,15 @@
package vaultcas
import (
"bytes"
"context"
"crypto/sha256"
"crypto/x509"
"encoding/hex"
"encoding/json"
"encoding/pem"
"math/big"
"strings"
"time"
"github.com/pkg/errors"
@ -14,7 +17,6 @@ import (
vault "github.com/hashicorp/vault/api"
auth "github.com/hashicorp/vault/api/auth/approle"
certutil "github.com/hashicorp/vault/sdk/helper/certutil"
)
func init() {
@ -28,7 +30,7 @@ type VaultOptions struct {
PKIRoleDefault string `json:"PKIRoleDefault,omitempty"`
PKIRoleRSA string `json:"pkiRoleRSA,omitempty"`
PKIRoleEC string `json:"pkiRoleEC,omitempty"`
PKIRoleEd25519 string `json:"PKIRoleEd25519,omitempty"`
PKIRoleEd25519 string `json:"pkiRoleEd25519,omitempty"`
RoleID string `json:"roleID,omitempty"`
SecretID auth.SecretID `json:"secretID,omitempty"`
AppRole string `json:"appRole,omitempty"`
@ -42,207 +44,12 @@ type VaultCAS struct {
fingerprint string
}
type Certificate struct {
type certBundle struct {
leaf *x509.Certificate
intermediates []*x509.Certificate
root *x509.Certificate
}
func loadOptions(config json.RawMessage) (*VaultOptions, error) {
var vc *VaultOptions
err := json.Unmarshal(config, &vc)
if err != nil {
return nil, errors.Wrap(err, "error decoding vaultCAS config")
}
if vc.PKI == "" {
vc.PKI = "pki" // use default pki vault name
}
if vc.PKIRoleDefault == "" {
vc.PKIRoleDefault = "default" // use default pki role name
}
if vc.PKIRoleRSA == "" {
vc.PKIRoleRSA = vc.PKIRoleDefault
}
if vc.PKIRoleEC == "" {
vc.PKIRoleEC = vc.PKIRoleDefault
}
if vc.PKIRoleEd25519 == "" {
vc.PKIRoleEd25519 = vc.PKIRoleDefault
}
if vc.RoleID == "" {
return nil, errors.New("vaultCAS config options must define `roleID`")
}
if vc.SecretID.FromEnv == "" && vc.SecretID.FromFile == "" && vc.SecretID.FromString == "" {
return nil, errors.New("vaultCAS config options must define `secretID` object with one of `FromEnv`, `FromFile` or `FromString`")
}
if vc.PKI == "" {
vc.PKI = "pki" // use default pki vault name
}
if vc.AppRole == "" {
vc.AppRole = "auth/approle"
}
return vc, nil
}
func certificateSort(n []*x509.Certificate) bool {
// sort all cert using bubble sort
isSorted := false
s := 0
maxSwap := len(n) * (len(n) - 1) / 2
for s <= maxSwap && !isSorted {
isSorted = true
var i = 0
for i < len(n)-1 {
if !isSignedBy(n[i], n[i+1]) {
// swap
n[i], n[i+1] = n[i+1], n[i]
isSorted = false
}
i++
}
s++
}
return isSorted
}
func isSignedBy(i, j *x509.Certificate) bool {
signer := x509.NewCertPool()
signer.AddCert(j)
opts := x509.VerifyOptions{
Roots: signer,
Intermediates: x509.NewCertPool(), // set empty to avoid using system CA
}
_, err := i.Verify(opts)
return err == nil
}
func parseCertificates(pemCert string) []*x509.Certificate {
var certs []*x509.Certificate
rest := []byte(pemCert)
var block *pem.Block
for {
block, rest = pem.Decode(rest)
if block == nil {
break
}
cert, err := x509.ParseCertificate(block.Bytes)
if err != nil {
break
}
certs = append(certs, cert)
}
return certs
}
func getCertificateAndChain(certb certutil.CertBundle) (*Certificate, error) {
// certutil.CertBundle contains CAChain and Certificate.
// Both could have a common part or different and we are not sure
// how user define their chain inside vault.
// We will create an array of certificate with all parsed certificates
// then sort the array to create a consistent chain
var root *x509.Certificate
var leaf *x509.Certificate
intermediates := make([]*x509.Certificate, 0)
used := make(map[string]bool) // ensure that intermediate are uniq
for _, chain := range append(certb.CAChain, certb.Certificate) {
for _, cert := range parseCertificates(chain) {
if used[cert.SerialNumber.String()] {
continue
}
used[cert.SerialNumber.String()] = true
switch {
case isRoot(cert):
root = cert
case cert.BasicConstraintsValid && cert.IsCA:
intermediates = append(intermediates, cert)
default:
leaf = cert
}
}
}
if ok := certificateSort(intermediates); !ok {
return nil, errors.Errorf("failed to sort certificate, probably one of cert is not part of the chain")
}
certificate := &Certificate{
root: root,
leaf: leaf,
intermediates: intermediates,
}
return certificate, nil
}
func parseCertificateRequest(pemCsr string) (*x509.CertificateRequest, error) {
block, _ := pem.Decode([]byte(pemCsr))
if block == nil {
return nil, errors.Errorf("error decoding certificate request: not a valid PEM encoded block, please verify\r\n%v", pemCsr)
}
cr, err := x509.ParseCertificateRequest(block.Bytes)
if err != nil {
return nil, errors.Wrap(err, "error parsing certificate request")
}
return cr, nil
}
func (v *VaultCAS) createCertificate(cr *x509.CertificateRequest, lifetime time.Duration) (*x509.Certificate, []*x509.Certificate, error) {
var vaultPKIRole string
switch {
case cr.PublicKeyAlgorithm == x509.RSA:
vaultPKIRole = v.config.PKIRoleRSA
case cr.PublicKeyAlgorithm == x509.ECDSA:
vaultPKIRole = v.config.PKIRoleEC
case cr.PublicKeyAlgorithm == x509.Ed25519:
vaultPKIRole = v.config.PKIRoleEd25519
default:
return nil, nil, errors.Errorf("createCertificate: Unsupported public key algorithm '%v'", cr.PublicKeyAlgorithm)
}
certPemBytes := pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE REQUEST", Bytes: cr.Raw})
if certPemBytes == nil {
return nil, nil, errors.Errorf("createCertificate: Failed to encode pem '%v'", cr.Raw)
}
y := map[string]interface{}{
"csr": string(certPemBytes),
"format": "pem_bundle",
"ttl": lifetime.Seconds(),
}
secret, err := v.client.Logical().Write(v.config.PKI+"/sign/"+vaultPKIRole, y)
if err != nil {
return nil, nil, errors.Wrapf(err, "createCertificate: unable to sign certificate %v", y)
}
if secret == nil {
return nil, nil, errors.New("createCertificate: secret sign is empty")
}
var certBundle certutil.CertBundle
if err := unmarshalMap(secret.Data, &certBundle); err != nil {
return nil, nil, errors.Wrap(err, "error unmarshaling cert bundle")
}
cert, err := getCertificateAndChain(certBundle)
if err != nil {
return nil, nil, err
}
// Return certificate and certificate chain
return cert.leaf, cert.intermediates, nil
}
// New creates a new CertificateAuthorityService implementation
// using Hashicorp Vault
func New(ctx context.Context, opts apiv1.Options) (*VaultCAS, error) {
@ -305,9 +112,9 @@ func New(ctx context.Context, opts apiv1.Options) (*VaultCAS, error) {
func (v *VaultCAS) CreateCertificate(req *apiv1.CreateCertificateRequest) (*apiv1.CreateCertificateResponse, error) {
switch {
case req.CSR == nil:
return nil, errors.New("CreateCertificate: `CSR` cannot be nil")
return nil, errors.New("createCertificate `csr` cannot be nil")
case req.Lifetime == 0:
return nil, errors.New("CreateCertificate: `LIFETIME` cannot be 0")
return nil, errors.New("createCertificate `lifetime` cannot be 0")
}
cert, chain, err := v.createCertificate(req.CSR, req.Lifetime)
@ -324,26 +131,28 @@ func (v *VaultCAS) CreateCertificate(req *apiv1.CreateCertificateRequest) (*apiv
func (v *VaultCAS) GetCertificateAuthority(req *apiv1.GetCertificateAuthorityRequest) (*apiv1.GetCertificateAuthorityResponse, error) {
secret, err := v.client.Logical().Read(v.config.PKI + "/cert/ca_chain")
if err != nil {
return nil, errors.Wrap(err, "unable to read root")
return nil, errors.Wrap(err, "error reading ca chain")
}
if secret == nil {
return nil, errors.New("secret root is empty")
return nil, errors.New("error reading ca chain: response is empty")
}
var certBundle certutil.CertBundle
if err := unmarshalMap(secret.Data, &certBundle); err != nil {
return nil, errors.Wrap(err, "error unmarshaling cert bundle")
chain, ok := secret.Data["certificate"].(string)
if !ok {
return nil, errors.New("error unmarshaling vault response: certificate not found")
}
cert, err := getCertificateAndChain(certBundle)
cert, err := getCertificateBundle(chain)
if err != nil {
return nil, err
}
if cert.root == nil {
return nil, errors.New("error unmarshaling vault response: root certificate not found")
}
sha256Sum := sha256.Sum256(cert.root.Raw)
expectedSum := certutil.GetHexFormatted(sha256Sum[:], "")
if expectedSum != v.fingerprint {
return nil, errors.Errorf("Vault Root CA fingerprint `%s` doesn't match config fingerprint `%v`", expectedSum, v.fingerprint)
sum := sha256.Sum256(cert.root.Raw)
if !strings.EqualFold(v.fingerprint, strings.ToLower(hex.EncodeToString(sum[:]))) {
return nil, errors.New("error verifying vault root: fingerprint does not match")
}
return &apiv1.GetCertificateAuthorityResponse{
@ -357,34 +166,28 @@ func (v *VaultCAS) RenewCertificate(req *apiv1.RenewCertificateRequest) (*apiv1.
return nil, apiv1.ErrNotImplemented{Message: "vaultCAS does not support renewals"}
}
// RevokeCertificate revokes a certificate by serial number.
func (v *VaultCAS) RevokeCertificate(req *apiv1.RevokeCertificateRequest) (*apiv1.RevokeCertificateResponse, error) {
if req.SerialNumber == "" && req.Certificate == nil {
return nil, errors.New("`serialNumber` or `certificate` are required")
return nil, errors.New("revokeCertificate `serialNumber` or `certificate` are required")
}
var serialNumber []byte
var sn *big.Int
if req.SerialNumber != "" {
// req.SerialNumber is a big.Int string representation
n := new(big.Int)
n, ok := n.SetString(req.SerialNumber, 10)
if !ok {
return nil, errors.Errorf("serialNumber `%v` can't be convert to big.Int", req.SerialNumber)
var ok bool
if sn, ok = new(big.Int).SetString(req.SerialNumber, 10); !ok {
return nil, errors.Errorf("error parsing serialNumber: %v cannot be converted to big.Int", req.SerialNumber)
}
serialNumber = n.Bytes()
} else {
// req.Certificate.SerialNumber is a big.Int
serialNumber = req.Certificate.SerialNumber.Bytes()
sn = req.Certificate.SerialNumber
}
serialNumberDash := certutil.GetHexFormatted(serialNumber, "-")
y := map[string]interface{}{
"serial_number": serialNumberDash,
vaultReq := map[string]interface{}{
"serial_number": formatSerialNumber(sn),
}
_, err := v.client.Logical().Write(v.config.PKI+"/revoke/", y)
_, err := v.client.Logical().Write(v.config.PKI+"/revoke/", vaultReq)
if err != nil {
return nil, errors.Wrap(err, "unable to revoke certificate")
return nil, errors.Wrap(err, "error revoking certificate")
}
return &apiv1.RevokeCertificateResponse{
@ -393,13 +196,136 @@ func (v *VaultCAS) RevokeCertificate(req *apiv1.RevokeCertificateRequest) (*apiv
}, nil
}
func unmarshalMap(m map[string]interface{}, v interface{}) error {
b, err := json.Marshal(m)
func (v *VaultCAS) createCertificate(cr *x509.CertificateRequest, lifetime time.Duration) (*x509.Certificate, []*x509.Certificate, error) {
var vaultPKIRole string
switch {
case cr.PublicKeyAlgorithm == x509.RSA:
vaultPKIRole = v.config.PKIRoleRSA
case cr.PublicKeyAlgorithm == x509.ECDSA:
vaultPKIRole = v.config.PKIRoleEC
case cr.PublicKeyAlgorithm == x509.Ed25519:
vaultPKIRole = v.config.PKIRoleEd25519
default:
return nil, nil, errors.Errorf("unsupported public key algorithm '%v'", cr.PublicKeyAlgorithm)
}
vaultReq := map[string]interface{}{
"csr": string(pem.EncodeToMemory(&pem.Block{
Type: "CERTIFICATE REQUEST",
Bytes: cr.Raw,
})),
"format": "pem_bundle",
"ttl": lifetime.Seconds(),
}
secret, err := v.client.Logical().Write(v.config.PKI+"/sign/"+vaultPKIRole, vaultReq)
if err != nil {
return err
return nil, nil, errors.Wrap(err, "error signing certificate")
}
if secret == nil {
return nil, nil, errors.New("error signing certificate: response is empty")
}
return json.Unmarshal(b, v)
chain, ok := secret.Data["certificate"].(string)
if !ok {
return nil, nil, errors.New("error unmarshaling vault response: certificate not found")
}
cert, err := getCertificateBundle(chain)
if err != nil {
return nil, nil, err
}
// Return certificate and certificate chain
return cert.leaf, cert.intermediates, nil
}
func loadOptions(config json.RawMessage) (*VaultOptions, error) {
var vc *VaultOptions
err := json.Unmarshal(config, &vc)
if err != nil {
return nil, errors.Wrap(err, "error decoding vaultCAS config")
}
if vc.PKI == "" {
vc.PKI = "pki" // use default pki vault name
}
if vc.PKIRoleDefault == "" {
vc.PKIRoleDefault = "default" // use default pki role name
}
if vc.PKIRoleRSA == "" {
vc.PKIRoleRSA = vc.PKIRoleDefault
}
if vc.PKIRoleEC == "" {
vc.PKIRoleEC = vc.PKIRoleDefault
}
if vc.PKIRoleEd25519 == "" {
vc.PKIRoleEd25519 = vc.PKIRoleDefault
}
if vc.RoleID == "" {
return nil, errors.New("vaultCAS config options must define `roleID`")
}
if vc.SecretID.FromEnv == "" && vc.SecretID.FromFile == "" && vc.SecretID.FromString == "" {
return nil, errors.New("vaultCAS config options must define `secretID` object with one of `FromEnv`, `FromFile` or `FromString`")
}
if vc.PKI == "" {
vc.PKI = "pki" // use default pki vault name
}
if vc.AppRole == "" {
vc.AppRole = "auth/approle"
}
return vc, nil
}
func parseCertificates(pemCert string) []*x509.Certificate {
var certs []*x509.Certificate
rest := []byte(pemCert)
var block *pem.Block
for {
block, rest = pem.Decode(rest)
if block == nil {
break
}
cert, err := x509.ParseCertificate(block.Bytes)
if err != nil {
break
}
certs = append(certs, cert)
}
return certs
}
func getCertificateBundle(chain string) (*certBundle, error) {
var root *x509.Certificate
var leaf *x509.Certificate
var intermediates []*x509.Certificate
for _, cert := range parseCertificates(chain) {
switch {
case isRoot(cert):
root = cert
case cert.BasicConstraintsValid && cert.IsCA:
intermediates = append(intermediates, cert)
default:
leaf = cert
}
}
certificate := &certBundle{
root: root,
leaf: leaf,
intermediates: intermediates,
}
return certificate, nil
}
// isRoot returns true if the given certificate is a root certificate.
@ -409,3 +335,16 @@ func isRoot(cert *x509.Certificate) bool {
}
return false
}
// formatSerialNumber formats a serial number to a dash-separated hexadecimal
// string.
func formatSerialNumber(sn *big.Int) string {
var ret bytes.Buffer
for _, b := range sn.Bytes() {
if ret.Len() > 0 {
ret.WriteString("-")
}
ret.WriteString(hex.EncodeToString([]byte{b}))
}
return ret.String()
}

19
cas/vaultcas/vaultcas_test.go
Unescape Escape View File

@ -16,6 +16,7 @@ import (
vault "github.com/hashicorp/vault/api"
auth "github.com/hashicorp/vault/api/auth/approle"
"github.com/smallstep/certificates/cas/apiv1"
"go.step.sm/crypto/pemutil"
)
var (
@ -80,13 +81,13 @@ func mustParseCertificate(t *testing.T, pemCert string) *x509.Certificate {
return crt
}
func mustParseCertificateRequest(t *testing.T, pemCert string) *x509.CertificateRequest {
func mustParseCertificateRequest(t *testing.T, pemData string) *x509.CertificateRequest {
t.Helper()
crt, err := parseCertificateRequest(pemCert)
csr, err := pemutil.ParseCertificateRequest([]byte(pemData))
if err != nil {
t.Fatal(err)
}
return crt
return csr
}
func testCAHelper(t *testing.T) (*url.URL, *vault.Client) {
@ -107,17 +108,17 @@ func testCAHelper(t *testing.T) (*url.URL, *vault.Client) {
}`)
case r.RequestURI == "/v1/pki/sign/ec":
w.WriteHeader(http.StatusOK)
cert := map[string]interface{}{"data": map[string]interface{}{"certificate": testCertificateSigned}}
cert := map[string]interface{}{"data": map[string]interface{}{"certificate": testCertificateSigned + "\n" + testRootCertificate}}
writeJSON(w, cert)
return
case r.RequestURI == "/v1/pki/sign/rsa":
w.WriteHeader(http.StatusOK)
cert := map[string]interface{}{"data": map[string]interface{}{"certificate": testCertificateSigned}}
cert := map[string]interface{}{"data": map[string]interface{}{"certificate": testCertificateSigned + "\n" + testRootCertificate}}
writeJSON(w, cert)
return
case r.RequestURI == "/v1/pki/sign/ed25519":
w.WriteHeader(http.StatusOK)
cert := map[string]interface{}{"data": map[string]interface{}{"certificate": testCertificateSigned}}
cert := map[string]interface{}{"data": map[string]interface{}{"certificate": testCertificateSigned + "\n" + testRootCertificate}}
writeJSON(w, cert)
return
case r.RequestURI == "/v1/pki/cert/ca_chain":
@ -232,21 +233,21 @@ func TestVaultCAS_CreateCertificate(t *testing.T) {
Lifetime: time.Hour,
}}, &apiv1.CreateCertificateResponse{
Certificate: mustParseCertificate(t, testCertificateSigned),
CertificateChain: []*x509.Certificate{},
CertificateChain: nil,
}, false},
{"ok rsa", fields{client, options}, args{&apiv1.CreateCertificateRequest{
CSR: mustParseCertificateRequest(t, testCertificateCsrRsa),
Lifetime: time.Hour,
}}, &apiv1.CreateCertificateResponse{
Certificate: mustParseCertificate(t, testCertificateSigned),
CertificateChain: []*x509.Certificate{},
CertificateChain: nil,
}, false},
{"ok ed25519", fields{client, options}, args{&apiv1.CreateCertificateRequest{
CSR: mustParseCertificateRequest(t, testCertificateCsrEd25519),
Lifetime: time.Hour,
}}, &apiv1.CreateCertificateResponse{
Certificate: mustParseCertificate(t, testCertificateSigned),
CertificateChain: []*x509.Certificate{},
CertificateChain: nil,
}, false},
{"fail CSR", fields{client, options}, args{&apiv1.CreateCertificateRequest{
CSR: nil,

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