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main.go
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main.go
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package main
import (
"bytes"
"context"
"encoding/json"
"log"
"math"
"net/http"
"os"
"time"
"github.com/golang-jwt/jwt/v4"
vault "github.com/hashicorp/vault/api"
v1 "k8s.io/api/core/v1"
metaV1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
)
type vaultLogin struct {
RequestID string `json:"request_id"`
LeaseID string `json:"lease_id"`
Renewable bool `json:"renewable"`
LeaseDuration int `json:"lease_duration"`
Data interface{} `json:"data"`
WrapInfo interface{} `json:"wrap_info"`
Warnings interface{} `json:"warnings"`
Auth struct {
ClientToken string `json:"client_token"`
Accessor string `json:"accessor"`
Policies []string `json:"policies"`
TokenPolicies []string `json:"token_policies"`
Metadata struct {
Username string `json:"username"`
} `json:"metadata"`
LeaseDuration int `json:"lease_duration"`
Renewable bool `json:"renewable"`
EntityID string `json:"entity_id"`
TokenType string `json:"token_type"`
Orphan bool `json:"orphan"`
} `json:"auth"`
}
var (
vaultAddr = os.Getenv("VAULT_ADDR")
authPath = os.Getenv("VAULT_AUTH_PATH")
authRole = os.Getenv("VAULT_AUTH_ROLE")
vaultNamespace = os.Getenv("VAULT_NAMESPACE")
appRolePath = os.Getenv("VAULT_APP_ROLE_PATH")
appRoleName = os.Getenv("VAULT_APP_ROLE_NAME")
secretIdSecret = os.Getenv("SECRET_ID_SECRET")
)
func getSaToken() string {
var expiration time.Time
nowTime := time.Now().Unix()
saToken, err := os.ReadFile("/var/run/secrets/kubernetes.io/serviceaccount/token")
tokenString := string(saToken)
if err != nil {
log.Fatalf("%v", err)
}
token, _, err := new(jwt.Parser).ParseUnverified(tokenString, jwt.MapClaims{})
if err != nil {
log.Fatalf("error parsing service account token: %v", err)
}
if claims, ok := token.Claims.(jwt.MapClaims); ok {
switch exp := claims["exp"].(type) {
case float64:
expiration = time.Unix(int64(exp), 0)
case json.Number:
v, _ := exp.Int64()
expiration = time.Unix(v, 0)
}
if nowTime-expiration.Unix() > 0 {
log.Println("token expired")
}
} else {
log.Fatalf("error unmarshalling jwt claims: %v", err)
}
return tokenString
}
func vaultJwtLogin(tokenString string) string {
payload := map[string]string{
"role": authRole,
"jwt": tokenString,
}
json_data, err := json.Marshal(payload)
if err != nil {
log.Fatalf("error marshalling payload for jwt login: %v", err)
}
httpClient := &http.Client{
Timeout: 2 * time.Second,
}
req, err := http.NewRequest("POST", vaultAddr+"/v1/auth/"+authPath+"/login", bytes.NewReader(json_data))
if err != nil {
log.Fatalf("error building jwt authentication request: %v", err)
}
if vaultNamespace != "" {
req.Header.Add("X-VAULT-NAMESPACE", vaultNamespace)
}
resp, err := httpClient.Do(req)
if err != nil {
log.Fatalf("error authenticating with jwt token: %v", err)
}
var result vaultLogin
err = json.NewDecoder(resp.Body).Decode(&result)
if err != nil {
log.Fatalf("error parsing Vault login response: %v", err)
}
return result.Auth.ClientToken
}
func getSecretId(clientToken string) (secretID string, renewTimer int64) {
config := vault.DefaultConfig()
config.Address = vaultAddr
client, err := vault.NewClient(config)
if err != nil {
log.Fatalf("unable to initialize Vault client: %v", err)
}
if vaultNamespace != "" {
client.SetNamespace(vaultNamespace)
}
client.SetToken(clientToken)
path := "/auth/" + appRolePath + "/role/" + appRoleName + "/secret-id"
resp, err := client.Logical().Write(path, nil)
if err != nil {
log.Fatalf("error generating new secret-id: %v", err)
}
secretID = resp.Data["secret_id"].(string)
secretIdTtl, _ := resp.Data["secret_id_ttl"].(json.Number).Float64()
renewTimer = int64(math.Round(secretIdTtl * .6667))
return secretID, renewTimer
}
func createK8sSecret(secretID string) {
config, err := rest.InClusterConfig()
if err != nil {
log.Fatalf("error initializing kubernetes client config: %v", err)
}
clientset, err := kubernetes.NewForConfig(config)
if err != nil {
log.Fatalf("error initializing kubernetes client: %v", err)
}
namespace, err := os.ReadFile("/var/run/secrets/kubernetes.io/serviceaccount/namespace")
secret := &v1.Secret{
ObjectMeta: metaV1.ObjectMeta{
Name: secretIdSecret,
Namespace: string(namespace),
},
StringData: map[string]string{
"secretId": secretID,
},
}
if err != nil {
log.Fatalf("error retrieving namespace: %v", err)
}
secretsClient := clientset.CoreV1().Secrets(string(namespace))
_, err = secretsClient.Create(context.TODO(), secret, metaV1.CreateOptions{})
if err != nil {
_, err = secretsClient.Update(context.TODO(), secret, metaV1.UpdateOptions{})
if err != nil {
log.Fatalf("error updating kubernetes secret: %v", err)
}
}
}
func main() {
for {
tokenString := getSaToken()
clientToken := vaultJwtLogin(tokenString)
secretID, renewTimer := getSecretId(clientToken)
log.Println("Renewed secret-id")
createK8sSecret(secretID)
log.Printf("Synchronized to k8s secret. %v seconds until next renewal", renewTimer)
time.Sleep(time.Duration(renewTimer) * time.Second)
}
}