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vault.go
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vault.go
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/*
Copyright 2019 The Jetstack cert-manager contributors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package vault
import (
"crypto/x509"
"errors"
"fmt"
"net/http"
"path"
"path/filepath"
"strings"
"time"
vault "github.com/hashicorp/vault/api"
"github.com/hashicorp/vault/sdk/helper/certutil"
corelisters "k8s.io/client-go/listers/core/v1"
"github.com/jetstack/cert-manager/pkg/apis/certmanager/v1alpha2"
"github.com/jetstack/cert-manager/pkg/util/pki"
)
var _ Interface = &Vault{}
type VaultClientBuilder func(namespace string, secretsLister corelisters.SecretLister,
issuer v1alpha2.GenericIssuer) (Interface, error)
type Interface interface {
Sign(csrPEM []byte, duration time.Duration) (certPEM []byte, caPEM []byte, err error)
Sys() *vault.Sys
}
type Client interface {
NewRequest(method, requestPath string) *vault.Request
RawRequest(r *vault.Request) (*vault.Response, error)
SetToken(v string)
Token() string
Sys() *vault.Sys
}
type Vault struct {
secretsLister corelisters.SecretLister
issuer v1alpha2.GenericIssuer
namespace string
client Client
}
func New(namespace string, secretsLister corelisters.SecretLister,
issuer v1alpha2.GenericIssuer) (Interface, error) {
v := &Vault{
secretsLister: secretsLister,
namespace: namespace,
issuer: issuer,
}
cfg, err := v.newConfig()
if err != nil {
return nil, err
}
client, err := vault.NewClient(cfg)
if err != nil {
return nil, fmt.Errorf("error initializing Vault client: %s", err.Error())
}
if err := v.setToken(client); err != nil {
return nil, err
}
v.client = client
return v, nil
}
func (v *Vault) Sign(csrPEM []byte, duration time.Duration) (cert []byte, ca []byte, err error) {
csr, err := pki.DecodeX509CertificateRequestBytes(csrPEM)
if err != nil {
return nil, nil, fmt.Errorf("failed to decode CSR for signing: %s", err)
}
parameters := map[string]string{
"common_name": csr.Subject.CommonName,
"alt_names": strings.Join(csr.DNSNames, ","),
"ip_sans": strings.Join(pki.IPAddressesToString(csr.IPAddresses), ","),
"uri_sans": strings.Join(pki.URLsToString(csr.URIs), ","),
"ttl": duration.String(),
"csr": string(csrPEM),
"exclude_cn_from_sans": "true",
}
url := path.Join("/v1", v.issuer.GetSpec().Vault.Path)
request := v.client.NewRequest("POST", url)
if err := request.SetJSONBody(parameters); err != nil {
return nil, nil, fmt.Errorf("failed to build vault request: %s", err)
}
resp, err := v.client.RawRequest(request)
if err != nil {
return nil, nil, fmt.Errorf("failed to sign certificate by vault: %s", err)
}
defer resp.Body.Close()
vaultResult := certutil.Secret{}
err = resp.DecodeJSON(&vaultResult)
if err != nil {
return nil, nil, fmt.Errorf("failed to decode response returned by vault: %s", err)
}
parsedBundle, err := certutil.ParsePKIMap(vaultResult.Data)
if err != nil {
return nil, nil, fmt.Errorf("failed to decode response returned by vault: %s", err)
}
bundle, err := parsedBundle.ToCertBundle()
if err != nil {
return nil, nil, fmt.Errorf("unable to convert certificate bundle to PEM bundle: %s", err.Error())
}
var caPem []byte = nil
if len(bundle.CAChain) > 0 {
caPem = []byte(bundle.CAChain[0])
}
return []byte(bundle.ToPEMBundle()), caPem, nil
}
func (v *Vault) setToken(client Client) error {
tokenRef := v.issuer.GetSpec().Vault.Auth.TokenSecretRef
if tokenRef != nil {
token, err := v.tokenRef(tokenRef.Name, v.namespace, tokenRef.Key)
if err != nil {
return err
}
client.SetToken(token)
return nil
}
appRole := v.issuer.GetSpec().Vault.Auth.AppRole
if appRole != nil {
token, err := v.requestTokenWithAppRoleRef(client, appRole)
if err != nil {
return err
}
client.SetToken(token)
return nil
}
kubernetesAuth := v.issuer.GetSpec().Vault.Auth.Kubernetes
if kubernetesAuth != nil {
token, err := v.requestTokenWithKubernetesAuth(client, kubernetesAuth)
if err != nil {
return fmt.Errorf("error reading Kubernetes service account token from %s: %s", kubernetesAuth.SecretRef.Name, err.Error())
}
client.SetToken(token)
return nil
}
return fmt.Errorf("error initializing Vault client: tokenSecretRef, appRoleSecretRef, or Kubernetes auth role not set")
}
func (v *Vault) newConfig() (*vault.Config, error) {
cfg := vault.DefaultConfig()
cfg.Address = v.issuer.GetSpec().Vault.Server
certs := v.issuer.GetSpec().Vault.CABundle
if len(certs) == 0 {
return cfg, nil
}
caCertPool := x509.NewCertPool()
ok := caCertPool.AppendCertsFromPEM(certs)
if ok == false {
return nil, fmt.Errorf("error loading Vault CA bundle")
}
cfg.HttpClient.Transport.(*http.Transport).TLSClientConfig.RootCAs = caCertPool
return cfg, nil
}
func (v *Vault) tokenRef(name, namespace, key string) (string, error) {
secret, err := v.secretsLister.Secrets(namespace).Get(name)
if err != nil {
return "", err
}
if key == "" {
key = v1alpha2.DefaultVaultTokenAuthSecretKey
}
keyBytes, ok := secret.Data[key]
if !ok {
return "", fmt.Errorf("no data for %q in secret '%s/%s'", key, name, namespace)
}
token := string(keyBytes)
token = strings.TrimSpace(token)
return token, nil
}
func (v *Vault) appRoleRef(appRole *v1alpha2.VaultAppRole) (roleId, secretId string, err error) {
roleId = strings.TrimSpace(appRole.RoleId)
secret, err := v.secretsLister.Secrets(v.namespace).Get(appRole.SecretRef.Name)
if err != nil {
return "", "", err
}
key := appRole.SecretRef.Key
keyBytes, ok := secret.Data[key]
if !ok {
return "", "", fmt.Errorf("no data for %q in secret '%s/%s'", key, v.namespace, appRole.SecretRef.Name)
}
secretId = string(keyBytes)
secretId = strings.TrimSpace(secretId)
return roleId, secretId, nil
}
func (v *Vault) requestTokenWithAppRoleRef(client Client, appRole *v1alpha2.VaultAppRole) (string, error) {
roleId, secretId, err := v.appRoleRef(appRole)
if err != nil {
return "", err
}
parameters := map[string]string{
"role_id": roleId,
"secret_id": secretId,
}
authPath := appRole.Path
if authPath == "" {
authPath = "approle"
}
url := path.Join("/v1", "auth", authPath, "login")
request := client.NewRequest("POST", url)
err = request.SetJSONBody(parameters)
if err != nil {
return "", fmt.Errorf("error encoding Vault parameters: %s", err.Error())
}
resp, err := client.RawRequest(request)
if err != nil {
return "", fmt.Errorf("error logging in to Vault server: %s", err.Error())
}
defer resp.Body.Close()
vaultResult := vault.Secret{}
if err := resp.DecodeJSON(&vaultResult); err != nil {
return "", fmt.Errorf("unable to decode JSON payload: %s", err.Error())
}
token, err := vaultResult.TokenID()
if err != nil {
return "", fmt.Errorf("unable to read token: %s", err.Error())
}
if token == "" {
return "", errors.New("no token returned")
}
return token, nil
}
func (v *Vault) requestTokenWithKubernetesAuth(client Client, kubernetesAuth *v1alpha2.VaultKubernetesAuth) (string, error) {
secret, err := v.secretsLister.Secrets(v.namespace).Get(kubernetesAuth.SecretRef.Name)
if err != nil {
return "", err
}
key := kubernetesAuth.SecretRef.Key
if key == "" {
key = v1alpha2.DefaultVaultTokenAuthSecretKey
}
keyBytes, ok := secret.Data[key]
if !ok {
return "", fmt.Errorf("no data for %q in secret '%s/%s'", key, v.namespace, kubernetesAuth.SecretRef.Name)
}
jwt := string(keyBytes)
parameters := map[string]string{
"role": kubernetesAuth.Role,
"jwt": jwt,
}
mountPath := kubernetesAuth.Path
if mountPath == "" {
mountPath = v1alpha2.DefaultVaultKubernetesAuthMountPath
}
url := filepath.Join(mountPath, "login")
request := client.NewRequest("POST", url)
err = request.SetJSONBody(parameters)
if err != nil {
return "", fmt.Errorf("error encoding Vault parameters: %s", err.Error())
}
resp, err := client.RawRequest(request)
if err != nil {
return "", fmt.Errorf("error calling Vault server: %s", err.Error())
}
defer resp.Body.Close()
vaultResult := vault.Secret{}
err = resp.DecodeJSON(&vaultResult)
if err != nil {
return "", fmt.Errorf("unable to decode JSON payload: %s", err.Error())
}
token, err := vaultResult.TokenID()
if err != nil {
return "", fmt.Errorf("unable to read token: %s", err.Error())
}
return token, nil
}
func (v *Vault) Sys() *vault.Sys {
return v.client.Sys()
}