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Add support for AppRole authentication
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2 changed files with 53 additions and 20 deletions
13
README.md
13
README.md
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@ -4,7 +4,7 @@
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# Luzifer / vault2env
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`vault2env` is a really small utility to transfer fields of a key in [Vault](https://www.vaultproject.io/) into the environment. It uses the [`app-id` authentication mechanism](https://www.vaultproject.io/docs/auth/app-id.html) or simple [token authentication](https://www.vaultproject.io/docs/auth/token.html) to identify itself with the Vault server, fetches all fields in the specified key and returns export directives for bash / zsh. That way you can do `eval` stuff and pull those fields into your ENV.
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`vault2env` is a really small utility to transfer fields of a key in [Vault](https://www.vaultproject.io/) into the environment. It uses the [`app-role`](https://www.vaultproject.io/docs/auth/approle.html), [`app-id` authentication mechanism](https://www.vaultproject.io/docs/auth/app-id.html) or simple [token authentication](https://www.vaultproject.io/docs/auth/token.html) to identify itself with the Vault server, fetches all fields in the specified key and returns export directives for bash / zsh. That way you can do `eval` stuff and pull those fields into your ENV.
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## Usage
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@ -32,6 +32,13 @@ firstvalue
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```
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### Using CLI parameters
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The command does differ only with its parameters specified for the different authentication mechanisms:
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- When using AppRole you need to specify `--vault-role-id` and optionally `--vault-secret-id` if you're using the `bind_secret_id` flag for your AppRole
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- When using AppID specify `--vault-app-id` and `--vault-user-id`
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- When using Token auth only specify `--vault-token`
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```bash
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# vault2env --vault-addr="..." --vault-app-id="..." --vault-user-id="..." secret/my/path/with/keys
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export FIRST_KEY="firstvalue"
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@ -39,7 +46,3 @@ export SECOND_KEY="secondvalue"
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```
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Though it's possible to use CLI parameters I strongly recommend to stick to the ENV variant as it's possible under certain conditions to read CLI parameters on a shared system using for example `ps aux`.
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### Using a token instead of app-id authentication
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This is quite simple: Omit parameters `--vault-app-id` and `--vault-user-id` and their respective ENV variables but set `VAULT_TOKEN` or `--vault-token`.
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60
main.go
60
main.go
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@ -6,6 +6,7 @@ import (
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"log"
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"os"
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"os/exec"
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"strings"
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"github.com/Luzifer/go_helpers/env"
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"github.com/Luzifer/rconfig"
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@ -15,12 +16,20 @@ import (
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var (
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cfg = struct {
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VaultAddress string `flag:"vault-addr" env:"VAULT_ADDR" default:"https://127.0.0.1:8200" description:"Vault API address"`
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VaultAppID string `flag:"vault-app-id" env:"VAULT_APP_ID" default:"" description:"The app-id to use for authentication"`
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VaultUserID string `flag:"vault-user-id" env:"VAULT_USER_ID" default:"" description:"The user-id to use for authentication"`
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VaultToken string `flag:"vault-token" env:"VAULT_TOKEN" vardefault:"vault-token" description:"Specify a token to use instead of app-id auth"`
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Export bool `flag:"export,e" default:"false" description:"Show export statements instead of running the command specified"`
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VersionAndExit bool `flag:"version" default:"false" description:"Print program version and exit"`
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VaultAddress string `flag:"vault-addr" env:"VAULT_ADDR" default:"https://127.0.0.1:8200" description:"Vault API address"`
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AppIDAuth struct {
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AppID string `flag:"vault-app-id" env:"VAULT_APP_ID" default:"" description:"[DEPRECATED] The app-id to use for authentication"`
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UserID string `flag:"vault-user-id" env:"VAULT_USER_ID" default:"" description:"[DEPRECATED] The user-id to use for authentication"`
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}
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AppRoleAuth struct {
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RoleID string `flag:"vault-role-id" env:"VAULT_ROLE_ID" default:"" description:"ID of the role to use"`
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SecretID string `flag:"vault-secret-id" env:"VAULT_SECRET_ID" default:"" description:"Corresponding secret ID to the role"`
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}
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TokenAuth struct {
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Token string `flag:"vault-token" env:"VAULT_TOKEN" vardefault:"vault-token" description:"Specify a token to use instead of app-id auth"`
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}
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Export bool `flag:"export,e" default:"false" description:"Show export statements instead of running the command specified"`
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VersionAndExit bool `flag:"version" default:"false" description:"Print program version and exit"`
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}{}
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version = "dev"
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)
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@ -50,10 +59,6 @@ func init() {
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os.Exit(0)
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}
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if (cfg.VaultAppID == "" || cfg.VaultUserID == "") && cfg.VaultToken == "" {
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log.Fatalf("[ERR] You need to either set vault-app-id and vault-user-id or set vault-token")
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}
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if cfg.Export {
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if len(rconfig.Args()) != 2 {
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log.Fatalf("[ERR] Usage: vault2env --export [secret path]")
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@ -73,9 +78,28 @@ func main() {
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log.Fatalf("Unable to create client: %s", err)
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}
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if cfg.VaultToken == "" {
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loginSecret, lserr := client.Logical().Write("auth/app-id/login/"+cfg.VaultAppID, map[string]interface{}{
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"user_id": cfg.VaultUserID,
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switch {
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case cfg.TokenAuth.Token != "":
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client.SetToken(cfg.TokenAuth.Token)
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case cfg.AppRoleAuth.RoleID != "":
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data := map[string]interface{}{
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"role_id": cfg.AppRoleAuth.RoleID,
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}
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if cfg.AppRoleAuth.SecretID != "" {
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data["secret_id"] = cfg.AppRoleAuth.SecretID
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}
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loginSecret, lserr := client.Logical().Write("auth/approle/login", data)
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if lserr != nil || loginSecret.Auth == nil {
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log.Fatalf("Unable to fetch authentication token: %s", lserr)
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}
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client.SetToken(loginSecret.Auth.ClientToken)
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defer client.Auth().Token().RevokeSelf(client.Token())
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case cfg.AppIDAuth.AppID != "" && cfg.AppIDAuth.UserID != "":
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loginSecret, lserr := client.Logical().Write("auth/app-id/login/"+cfg.AppIDAuth.AppID, map[string]interface{}{
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"user_id": cfg.AppIDAuth.UserID,
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})
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if lserr != nil || loginSecret.Auth == nil {
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log.Fatalf("Unable to fetch authentication token: %s", lserr)
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@ -83,8 +107,14 @@ func main() {
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client.SetToken(loginSecret.Auth.ClientToken)
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defer client.Auth().Token().RevokeSelf(client.Token())
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} else {
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client.SetToken(cfg.VaultToken)
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default:
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log.Fatalf(strings.Join([]string{
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"[ERR] Did not find any authentication method. Try one of these:",
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"- Specify `--vault-token` for token based authentication",
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"- Specify `--vault-role-id` and optionally `--vault-secret-id` for AppRole authentication",
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"- Specify `--vault-app-id` and `--vault-user-id` for deprecated AppID authentication",
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}, "\n"))
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}
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data, err := client.Logical().Read(rconfig.Args()[1])
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