csrf

README

CSRF Middleware

CSRF middleware for Fiber that provides Cross-site request forgery protection by passing a csrf token via cookies. This cookie value will be used to compare against the client csrf token in POST requests. When the csrf token is invalid, this middleware will delete the csrf_ cookie and return the fiber.ErrForbidden error. CSRF Tokens are generated on GET requests. You can retrieve the CSRF token with c.Locals(contextKey), where contextKey is the string you set in the config (see Custom Config below).

NOTE: This middleware uses our Storage package to support various databases through a single interface. The default configuration for this middleware saves data to memory, see the examples below for other databases.

Table of Contents

• CSRF Middleware
  • Table of Contents
  • Signatures
  • Examples
    • Default Config
    • Custom Config
    • Custom Storage/Database
    • Config
    • Default Config

Signatures

func New(config ...Config) fiber.Handler

Examples

Import the middleware package that is part of the Fiber web framework

import (
  "github.com/gofiber/fiber/v2"
  "github.com/gofiber/fiber/v2/middleware/crsf"
)

After you initiate your Fiber app, you can use the following possibilities:

app.Use(csrf.New()) // Default config

Custom Config

app.Use(csrf.New(csrf.Config{
	KeyLookup:      "header:X-Csrf-Token",
	CookieName:     "csrf_",
	CookieSameSite: "Lax",
	Expiration:     1 * time.Hour,
	KeyGenerator:   utils.UUID,
}))

Custom Storage/Database

You can use any storage from our storage package.

storage := sqlite3.New() // From github.com/gofiber/storage/sqlite3
app.Use(csrf.New(csrf.Config{
	Storage: storage,
}))

Config

// Config defines the config for middleware.
type Config struct {
	// Next defines a function to skip this middleware when returned true.
	//
	// Optional. Default: nil
	Next func(c *fiber.Ctx) bool

	// KeyLookup is a string in the form of "<source>:<key>" that is used
	// to extract token from the request.
	// Possible values:
	// - "header:<name>"
	// - "query:<name>"
	// - "param:<name>"
	// - "form:<name>"
	// - "cookie:<name>"
	//
	// Optional. Default: "header:X-CSRF-Token"
	KeyLookup string

	// Name of the session cookie. This cookie will store session key.
	// Optional. Default value "csrf_".
	CookieName string

	// Domain of the CSRF cookie.
	// Optional. Default value "".
	CookieDomain string

	// Path of the CSRF cookie.
	// Optional. Default value "".
	CookiePath string

	// Indicates if CSRF cookie is secure.
	// Optional. Default value false.
	CookieSecure bool

	// Indicates if CSRF cookie is HTTP only.
	// Optional. Default value false.
	CookieHTTPOnly bool

	// Indicates if CSRF cookie is requested by SameSite.
	// Optional. Default value "Lax".
	CookieSameSite string

	// Expiration is the duration before csrf token will expire
	//
	// Optional. Default: 1 * time.Hour
	Expiration time.Duration

	// Store is used to store the state of the middleware
	//
	// Optional. Default: memory.New()
	Storage fiber.Storage

	// Context key to store generated CSRF token into context.
	// If left empty, token will not be stored in context.
	//
	// Optional. Default: ""
	ContextKey string

	// KeyGenerator creates a new CSRF token
	//
	// Optional. Default: utils.UUID
	KeyGenerator func() string
}

Default Config

var ConfigDefault = Config{
	KeyLookup:      "header:X-Csrf-Token",
	CookieName:     "csrf_",
	CookieSameSite: "Lax",
	Expiration:     1 * time.Hour,
	KeyGenerator:   utils.UUID,
}

Documentation

Index

• Variables
• func New(config ...Config) fiber.Handler
• type Config

Variables

var ConfigDefault = Config{
	KeyLookup:      "header:X-Csrf-Token",
	CookieName:     "csrf_",
	CookieSameSite: "Lax",
	Expiration:     1 * time.Hour,
	KeyGenerator:   utils.UUID,
	ErrorHandler:   defaultErrorHandler,
	// contains filtered or unexported fields
}

ConfigDefault is the default config

Functions

func New

func New(config ...Config) fiber.Handler

New creates a new middleware handler

Types

type Config

type Config struct {
	// Next defines a function to skip this middleware when returned true.
	//
	// Optional. Default: nil
	Next func(c *fiber.Ctx) bool

	// KeyLookup is a string in the form of "<source>:<key>" that is used
	// to extract token from the request.
	// Possible values:
	// - "header:<name>"
	// - "query:<name>"
	// - "param:<name>"
	// - "form:<name>"
	// - "cookie:<name>"
	//
	// Optional. Default: "header:X-CSRF-Token"
	KeyLookup string

	// Name of the session cookie. This cookie will store session key.
	// Optional. Default value "csrf_".
	CookieName string

	// Domain of the CSRF cookie.
	// Optional. Default value "".
	CookieDomain string

	// Path of the CSRF cookie.
	// Optional. Default value "".
	CookiePath string

	// Indicates if CSRF cookie is secure.
	// Optional. Default value false.
	CookieSecure bool

	// Indicates if CSRF cookie is HTTP only.
	// Optional. Default value false.
	CookieHTTPOnly bool

	// Value of SameSite cookie.
	// Optional. Default value "Lax".
	CookieSameSite string

	// Expiration is the duration before csrf token will expire
	//
	// Optional. Default: 1 * time.Hour
	Expiration time.Duration

	// Store is used to store the state of the middleware
	//
	// Optional. Default: memory.New()
	Storage fiber.Storage

	// Context key to store generated CSRF token into context.
	// If left empty, token will not be stored in context.
	//
	// Optional. Default: ""
	ContextKey string

	// KeyGenerator creates a new CSRF token
	//
	// Optional. Default: utils.UUID
	KeyGenerator func() string

	// Deprecated, please use Expiration
	CookieExpires time.Duration

	// Deprecated, please use Cookie* related fields
	Cookie *fiber.Cookie

	// Deprecated, please use KeyLookup
	TokenLookup string

	// ErrorHandler is executed when an error is returned from fiber.Handler.
	//
	// Optional. Default: DefaultErrorHandler
	ErrorHandler fiber.ErrorHandler
	// contains filtered or unexported fields
}

Config defines the config for middleware.