SHA_HEX=$(cat plugin.sha256) vault plugin register \ -sha256="$SHA_HEX" \ -command="vault-plugin-sample" \ secret/vault-plugin-sample Use code with caution. 3. Mount and Enable the Engine
package backend import ( "context" "crypto/rand" "encoding/hex" "fmt" "://github.com" "://github.com" ) // Factory returns a new backend instance for Vault to mount func Factory(ctx context.Context, conf *logical.BackendConfig) (logical.Backend, error) { b := &customBackend{} b.Backend = &framework.Backend{ Help: "A custom secrets engine that generates mock API tokens.", PathsSpecial: &logical.Paths{ SealMigrationPaths: []string{}, }, Paths: []*framework.Path Pattern: "token/" + framework.GenericNameRegex("name"), Fields: map[string]*framework.FieldSchema "name": Type: framework.TypeString, Description: "The identifier for the token owner.", Required: true, , "environment": Type: framework.TypeString, Description: "Deployment environment (e.g., dev, prod).", Default: "dev", , , Operations: map[logical.Operation]framework.OperationHandler logical.ReadOperation: &framework.PathOperation Callback: b.handleReadToken, , , , , BackendType: logical.TypeLogical, } if err := b.Setup(ctx, conf); err != nil return nil, err return b, nil } type customBackend struct *framework.Backend func (b *customBackend) handleReadToken(ctx context.Context, req *logical.Request, data *framework.FieldData) (*logical.Response, error) { name := data.Get("name").(string) env := data.Get("environment").(string) // Generate a secure random token bytes := make([]byte, 16) if _, err := rand.Read(bytes); err != nil return nil, fmt.Errorf("failed to generate random token bytes: %w", err) generatedKey := hex.EncodeToString(bytes) // Return the secret payload to Vault return &logical.Response{ Data: map[string]interface{} "api_key": fmt.Sprintf("sk_%s_%s", env, generatedKey), "owner": name, "environment": env, , }, nil } Use code with caution. 4. Compiling and Verifying the Plugin Binary
: If you use LuckPerms or an economy plugin like EssentialsX, you must have Vault installed for prefixes and currency to work correctly. vault plugin new
To compile a Vault plugin, you need a functional Go toolchain and the official Vault SDK. Create a new directory and initialize your Go module:
package main import ( "context" "://github.com" "://github.com" ) type Backend struct *framework.Backend func Factory(ctx context.Context, conf *logical.BackendConfig) (logical.Backend, error) { b := &Backend{} b.Backend = &framework.Backend Help: "A new custom Vault plugin that stores simple strings.", PathsSpecial: &logical.Paths SealProcessable: []string"config", , Paths: []*framework.Path pathConfig(b), , BackendType: logical.TypeLogical, return b, nil } Use code with caution. 4. Create Path Handlers SHA_HEX=$(cat plugin
Pattern: "login", Operations: map[logical.Operation]framework.OperationHandler logical.UpdateOperation: &framework.PathOperationCallback: b.pathLogin, ,
Also update the path pattern in backend.go to simplify access: Create a new directory and initialize your Go
Plugins run as standalone OS processes outside the main Vault memory space. A crash in a plugin cannot corrupt Vault core memory or expose master keys.
The main.go file serves as the executable entry point. It tells Vault how to serve the plugin over gRPC using the Vault SDK.
# Enable the custom secrets engine vault secrets enable -path=custom-data my-custom-plugin
This compiles phish into ./bin/phish (or phish.exe on Windows, though not recommended).
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