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package vault
import (
"fmt"
"io/ioutil"
"os"
"path"
"strings"
"time"
"github.com/hairyhenderson/gomplate/v3/aws"
"github.com/hairyhenderson/gomplate/v3/conv"
"github.com/hairyhenderson/gomplate/v3/env"
"github.com/hairyhenderson/gomplate/v3/internal/config"
"github.com/pkg/errors"
)
// GetToken -
func (v *Vault) GetToken() (string, error) {
// sorted in order of precedence
authFuncs := []func() (string, error){
v.AppRoleLogin,
v.AppIDLogin,
v.GitHubLogin,
v.UserPassLogin,
v.TokenLogin,
v.EC2Login,
}
for _, f := range authFuncs {
if token, err := f(); token != "" || err != nil {
return token, err
}
}
return "", errors.New("no vault auth methods succeeded")
}
// AppIDLogin - app-id auth backend
func (v *Vault) AppIDLogin() (string, error) {
appID := env.Getenv("VAULT_APP_ID")
userID := env.Getenv("VAULT_USER_ID")
if appID == "" || userID == "" {
return "", nil
}
mount := env.Getenv("VAULT_AUTH_APP_ID_MOUNT", "app-id")
vars := map[string]interface{}{
"user_id": userID,
}
path := fmt.Sprintf("auth/%s/login/%s", mount, appID)
secret, err := v.client.Logical().Write(path, vars)
if err != nil {
return "", errors.Wrapf(err, "appID logon failed")
}
if secret == nil {
return "", errors.New("empty response from AppID logon")
}
return secret.Auth.ClientToken, nil
}
// AppRoleLogin - approle auth backend
func (v *Vault) AppRoleLogin() (string, error) {
roleID := env.Getenv("VAULT_ROLE_ID")
secretID := env.Getenv("VAULT_SECRET_ID")
if roleID == "" || secretID == "" {
return "", nil
}
mount := env.Getenv("VAULT_AUTH_APPROLE_MOUNT", "approle")
vars := map[string]interface{}{
"role_id": roleID,
"secret_id": secretID,
}
path := fmt.Sprintf("auth/%s/login", mount)
secret, err := v.client.Logical().Write(path, vars)
if err != nil {
return "", errors.Wrap(err, "appRole logon failed")
}
if secret == nil {
return "", errors.New("empty response from AppRole logon")
}
return secret.Auth.ClientToken, nil
}
// GitHubLogin - github auth backend
func (v *Vault) GitHubLogin() (string, error) {
githubToken := env.Getenv("VAULT_AUTH_GITHUB_TOKEN")
if githubToken == "" {
return "", nil
}
mount := env.Getenv("VAULT_AUTH_GITHUB_MOUNT", "github")
vars := map[string]interface{}{
"token": githubToken,
}
path := fmt.Sprintf("auth/%s/login", mount)
secret, err := v.client.Logical().Write(path, vars)
if err != nil {
return "", errors.Wrap(err, "appRole logon failed")
}
if secret == nil {
return "", errors.New("empty response from AppRole logon")
}
return secret.Auth.ClientToken, nil
}
// UserPassLogin - userpass auth backend
func (v *Vault) UserPassLogin() (string, error) {
username := env.Getenv("VAULT_AUTH_USERNAME")
password := env.Getenv("VAULT_AUTH_PASSWORD")
if username == "" || password == "" {
return "", nil
}
mount := env.Getenv("VAULT_AUTH_USERPASS_MOUNT", "userpass")
vars := map[string]interface{}{
"password": password,
}
path := fmt.Sprintf("auth/%s/login/%s", mount, username)
secret, err := v.client.Logical().Write(path, vars)
if err != nil {
return "", errors.Wrap(err, "userPass logon failed")
}
if secret == nil {
return "", errors.New("empty response from UserPass logon")
}
return secret.Auth.ClientToken, nil
}
// EC2Login - AWS EC2 auth backend
func (v *Vault) EC2Login() (string, error) {
mount := env.Getenv("VAULT_AUTH_AWS_MOUNT", "aws")
output := env.Getenv("VAULT_AUTH_AWS_NONCE_OUTPUT")
nonce := env.Getenv("VAULT_AUTH_AWS_NONCE")
vars, err := createEc2LoginVars(nonce)
if err != nil {
return "", err
}
if vars["pkcs7"] == "" {
return "", nil
}
path := fmt.Sprintf("auth/%s/login", mount)
secret, err := v.client.Logical().Write(path, vars)
if err != nil {
return "", errors.Wrapf(err, "AWS EC2 logon failed")
}
if secret == nil {
return "", errors.New("empty response from AWS EC2 logon")
}
if output != "" {
if val, ok := secret.Auth.Metadata["nonce"]; ok {
nonce = val
}
f, err := os.OpenFile(output, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, config.NormalizeFileMode(0o600))
if err != nil {
return "", errors.Wrapf(err, "Error opening nonce output file")
}
n, err := f.Write([]byte(nonce + "\n"))
if err != nil {
return "", errors.Wrapf(err, "Error writing nonce output file")
}
if n == 0 {
return "", errors.Wrapf(err, "No bytes written to nonce output file")
}
}
return secret.Auth.ClientToken, nil
}
func createEc2LoginVars(nonce string) (map[string]interface{}, error) {
role := env.Getenv("VAULT_AUTH_AWS_ROLE")
vars := map[string]interface{}{}
if role != "" {
vars["role"] = role
}
if nonce != "" {
vars["nonce"] = nonce
}
opts := aws.ClientOptions{
Timeout: time.Duration(conv.MustAtoi(env.Getenv("AWS_TIMEOUT"))) * time.Millisecond,
}
meta := aws.NewEc2Meta(opts)
doc, err := meta.Dynamic("instance-identity/pkcs7")
if err != nil {
return nil, err
}
vars["pkcs7"] = strings.ReplaceAll(strings.TrimSpace(doc), "\n", "")
return vars, nil
}
// TokenLogin -
func (v *Vault) TokenLogin() (string, error) {
if token := env.Getenv("VAULT_TOKEN"); token != "" {
return token, nil
}
homeDir, err := os.UserHomeDir()
if err != nil {
return "", err
}
f, err := os.OpenFile(path.Join(homeDir, ".vault-token"), os.O_RDONLY, 0)
if err != nil {
return "", nil
}
b, err := ioutil.ReadAll(f)
if err != nil {
return "", err
}
return string(b), nil
}
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