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Implement token retrieval using k8s sa #9

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36 changes: 30 additions & 6 deletions SecretsFromVault.go
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Original file line number Diff line number Diff line change
Expand Up @@ -33,6 +33,8 @@ type plugin struct {
VaultClient *api.Client
}

const saPath = "/run/secrets/kubernetes.io/serviceaccount/token"

//nolint: golint
//noinspection GoUnusedGlobalVariable
var KustomizePlugin plugin
Expand All @@ -43,11 +45,6 @@ func (p *plugin) Config(ldr ifc.Loader, rf *resmap.Factory, c []byte) error {
return errors.New("missing `VAULT_ADDR` env var: required")
}

vaultToken, err := getVaultToken()
if err != nil {
return err
}

config := &api.Config{
Address: vaultAddr,
}
Expand All @@ -57,6 +54,11 @@ func (p *plugin) Config(ldr ifc.Loader, rf *resmap.Factory, c []byte) error {
return err
}

vaultToken, err := getVaultToken(client)
if err != nil {
return err
}

client.SetToken(vaultToken)

p.rf = rf
Expand Down Expand Up @@ -91,9 +93,31 @@ func (p *plugin) Generate() (resmap.ResMap, error) {
return p.rf.FromSecretArgs(p.ldr, p.Spec.Options, args)
}

func getVaultToken() (string, error) {
func getVaultToken(client *api.Client) (string, error) {
t, exists := os.LookupEnv("VAULT_TOKEN")
if !exists {
backend, exists := os.LookupEnv("VAULT_BACKEND")
if exists {
role, exists := os.LookupEnv("VAULT_ROLE")
if exists == false {
return "", errors.New("No vault role is set for backend")
}

jwtByte, err := ioutil.ReadFile(saPath)
jwt := strings.TrimSpace(string(jwtByte))
options := map[string]interface{}{
"jwt": jwt,
"role": role,
}
path := fmt.Sprintf("auth/%s/login", backend)
secret, err := client.Logical().Write(path, options)
if err != nil {
return "", err
}

token := secret.Auth.ClientToken
return token, nil
}
tokenPath, exists := os.LookupEnv("VAULT_TOKEN_PATH")
if exists == false {
return "", errors.New("No vault token and no vault token path")
Expand Down