Detailed explanation of how Laravel uses salt and password authentication by modifying Auth

php artisan make:auth

Route::auth();

/**
 * Register the typical authentication routes for an application.
 *
 * @return void
 */
public function auth()
{
 // Authentication Routes...
 $this->get('login', 'Auth\AuthController@showLoginForm');
 $this->post('login', 'Auth\AuthController@login');
 $this->get('logout', 'Auth\AuthController@logout');

 // Registration Routes...
 $this->get('register', 'Auth\AuthController@showRegistrationForm');
 $this->post('register', 'Auth\AuthController@register');

 // Password Reset Routes...
 $this->get('password/reset/{token?}', 'Auth\PasswordController@showResetForm');
 $this->post('password/email', 'Auth\PasswordController@sendResetLinkEmail');
 $this->post('password/reset', 'Auth\PasswordController@reset');
}

/**
 * Handle a registration request for the application.
 *
 * @param \Illuminate\Http\Request $request
 * @return \Illuminate\Http\Response
 */
public function register(Request $request)
{
 $validator = $this->validator($request->all());

 if ($validator->fails()) {
 $this->throwValidationException(
  $request, $validator
 );
 }

 Auth::guard($this->getGuard())->login($this->create($request->all()));

 return redirect($this->redirectPath());
}

protected function validator(array $data)
{
 return Validator::make($data, [
 'name' => 'required|max:255',
 'email' => 'required|email|max:255|unique:user',
 'password' => 'required|size:40|confirmed',
 ]);
}

/**
 * Create a new user instance after a valid registration.
 *
 * @param array $data
 * @return User
 */
protected function create(array $data)
{
 $salt = Str::random(6);
 return User::create([
 'nickname' => $data['name'],
 'email' => $data['email'],
 'password' => sha1($salt . $data['password']),
 'register_time' => time(),
 'register_ip' => ip2long(request()->ip()),
 'salt' => $salt
 ]);
}

 $this->get('login', 'Auth\AuthController@showLoginForm');
 $this->post('login', 'Auth\AuthController@login');
 $this->get('logout', 'Auth\AuthController@logout');

/**
 * Handle a login request to the application.
 *
 * @param \Illuminate\Http\Request $request
 * @return \Illuminate\Http\Response
 */
public function login(Request $request)
{
 $this->validateLogin($request);
 $throttles = $this->isUsingThrottlesLoginsTrait();

 if ($throttles && $lockedOut = $this->hasTooManyLoginAttempts($request)) {
 $this->fireLockoutEvent($request);

 return $this->sendLockoutResponse($request);
 }

 $credentials = $this->getCredentials($request);

 if (Auth::guard($this->getGuard())->attempt($credentials, $request->has('remember'))) {
 return $this->handleUserWasAuthenticated($request, $throttles);
 }

 if ($throttles && ! $lockedOut) {
 $this->incrementLoginAttempts($request);
 }

 return $this->sendFailedLoginResponse($request);
}

public function attempt(array $credentials = [], $remember = false, $login = true)
{
 $this->fireAttemptEvent($credentials, $remember, $login);

 $this->lastAttempted = $user = $this->provider->retrieveByCredentials($credentials);

 if ($this->hasValidCredentials($user, $credentials)) {
 if ($login) {
  $this->login($user, $remember);
 }

 return true;
 }

 if ($login) {
 $this->fireFailedEvent($user, $credentials);
 }

 return false;
}

/**
 * Determine if the user matches the credentials.
 *
 * @param mixed $user
 * @param array $credentials
 * @return bool
 */

protected function hasValidCredentials($user, $credentials)
{
 return ! is_null($user) && $this->provider->validateCredentials($user, $credentials);
}

'providers' => [
 'users' => [
 'driver' => 'eloquent',
 'model' => App\User::class, //这个是driver用的Model
 ],
],

/**
 * Retrieve a user by the given credentials.
 *
 * @param array $credentials
 * @return \Illuminate\Contracts\Auth\Authenticatable|null
 */
public function retrieveByCredentials(array $credentials)
{
 if (empty($credentials)) {
 return;
 }

 $query = $this->createModel()->newQuery();
 foreach ($credentials as $key => $value) {
 if (! Str::contains($key, 'password')) {
  $query->where($key, $value);
 }
 }
 return $query->first();
}

/**
 * Validate a user against the given credentials.
 *
 * @param \Illuminate\Contracts\Auth\Authenticatable $user
 * @param array $credentials
 * @return bool
 */
public function validateCredentials(UserContract $user, array $credentials)
{
 $plain = $credentials['password'];

 return $this->hasher->check($plain, $user->getAuthPassword());
}

/**
 * The table associated to this model
 */
protected $table = 'user';／／用户表名不是laravel约定的这里要指定一下

/**
 * 禁用Laravel自动管理timestamp列
 */
public $timestamps = false;

/**
 * 覆盖Laravel中默认的getAuthPassword方法, 返回用户的password和salt字段
 * @return type
 */
public function getAuthPassword()
{
 return ['password' => $this->attributes['password'], 'salt' => $this->attributes['salt']];
}

namespace App\Foundation\Auth;

use Illuminate\Auth\EloquentUserProvider;
use Illuminate\Contracts\Auth\Authenticatable;
use Illuminate\Support\Str;

class AdminEloquentUserProvider extends EloquentUserProvider
{

 /**
  * Validate a user against the given credentials.
  *
  * @param \Illuminate\Contracts\Auth\Authenticatable $user
  * @param array $credentials
  */
 public function validateCredentials(Authenticatable $user, array $credentials) {
  $plain = $credentials['password'];
  $authPassword = $user->getAuthPassword();

  return sha1($authPassword['salt'] . $plain) == $authPassword['password'];
 }
}

'providers' => [
 'users' => [
  'driver' => 'admin-eloquent',
  'model' => App\User::class,
 ]
]

public function boot(GateContract $gate)
{
 $this->registerPolicies($gate);

 \Auth::provider('admin-eloquent', function ($app, $config) {
  return New \App\Foundation\Auth\AdminEloquentUserProvider($app['hash'], $config['model']);
 });
}

public function provider($name, Closure $callback)
{
 $this->customProviderCreators[$name] = $callback;

 return $this;
}

CREATE TABLE `password_resets` (
 `email` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
 `token` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
 `created_at` timestamp NOT NULL,
 KEY `password_resets_email_index` (`email`),
 KEY `password_resets_token_index` (`token`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

 $this->post('password/reset', 'Auth\PasswordController@reset');

/**
 * Reset the given user's password.
 *
 * @param \Illuminate\Http\Request $request
 * @return \Illuminate\Http\Response
 */
public function reset(Request $request)
{
 $this->validate(
  $request,
  $this->getResetValidationRules(),
  $this->getResetValidationMessages(),
  $this->getResetValidationCustomAttributes()
 );

 $credentials = $this->getResetCredentials($request);

 $broker = $this->getBroker();

 $response = Password::broker($broker)->reset($credentials, function ($user, $password) {
  $this->resetPassword($user, $password);
 });

 switch ($response) {
  case Password::PASSWORD_RESET:
   return $this->getResetSuccessResponse($response);
  default:
   return $this->getResetFailureResponse($request, $response);
 }
}

/**
 * Reset the password for the given token.
 *
 * @param array $credentials
 * @param \Closure $callback
 * @return mixed
 */
public function reset(array $credentials, Closure $callback)
{
 // If the responses from the validate method is not a user instance, we will
 // assume that it is a redirect and simply return it from this method and
 // the user is properly redirected having an error message on the post.
 $user = $this->validateReset($credentials);

 if (! $user instanceof CanResetPasswordContract) {
  return $user;
 }

 $pass = $credentials['password'];

 // Once we have called this callback, we will remove this token row from the
 // table and return the response from this callback so the user gets sent
 // to the destination given by the developers from the callback return.
 call_user_func($callback, $user, $pass);

 $this->tokens->delete($credentials['token']);

 return static::PASSWORD_RESET;
}

function ($user, $password) {
 $this->resetPassword($user, $password);
});

protected function resetPassword($user, $password)
{
 $user->forceFill([
  'password' => bcrypt($password),
  'remember_token' => Str::random(60),
 ])->save();

 Auth::guard($this->getGuard())->login($user);
}

/**
 * 覆盖ResetsPasswords traits里的resetPassword方法,改为用sha1(salt + password)的加密方式
 * Reset the given user's password.
 *
 * @param \Illuminate\Contracts\Auth\CanResetPassword $user
 * @param string $password
 * @return void
 */
protected function resetPassword($user, $password)
{
 $salt = Str::random(6);
 $user->forceFill([
  'password' => sha1($salt . $password),
  'salt' => $salt,
  'remember_token' => Str::random(60),
 ])->save();

 \Auth::guard($this->getGuard())->login($user);
}