Add core support for extendable authentication

add support for passwordless user creation; add filament loading support
for new laravel modules namespacing;
add support for pluggable password reset and login rules

app/Providers/FortifyServiceProvider.php

@@ -25,6 +25,73 @@ use Laravel\Fortify\Fortify;
 
 class FortifyServiceProvider extends ServiceProvider
 {
+    /**
+     * Dummy bcrypt hash compared against when no user matches the submitted
+     * email. Hash::check is run against it so login takes the same time whether
+     * or not the email exists — otherwise an unknown email would skip the
+     * (deliberately slow) hash and return faster, letting an attacker enumerate
+     * registered accounts by timing the response. The plaintext is irrelevant:
+     * it is only ever checked against attacker-supplied input and never matches.
+     */
+    private const ABSENT_USER_PASSWORD_HASH = '$2y$12$92IXUNpkjO0rOQ5byMi.Ye4oKoEa3Ro9llC/.og/at2.uheWG/igi';
+
+    /**
+     * Authorization rules applied AFTER the password is verified. Each rule
+     * receives the authenticated user + request and returns whether the login
+     * may proceed; any rule returning false denies it. This is an extension
+     * point: modules (e.g. SSO enforcement) add a rule to veto a password login
+     * instead of replacing this credential check — which would silently drift
+     * from the host logic the next time it changes.
+     *
+     * @var array<int, \Closure(User, Request): bool>
+     */
+    protected static array $loginRules = [];
+
+    /**
+     * Authorization rules applied before a password reset is completed. Rules
+     * receive the user being reset + submitted input and return whether the
+     * local reset flow may set a new password for that account.
+     *
+     * @var array<int, \Closure(User, array<string, mixed>): bool>
+     */
+    protected static array $passwordResetRules = [];
+
+    /**
+     * Register an additional rule that gates password login (see $loginRules).
+     *
+     * @param  \Closure(User, Request): bool  $rule
+     */
+    public static function authenticateUsingRule(\Closure $rule): void
+    {
+        static::$loginRules[] = $rule;
+    }
+
+    /**
+     * Register an additional rule that gates password reset completion.
+     *
+     * @param  \Closure(User, array<string, mixed>): bool  $rule
+     */
+    public static function resetPasswordUsingRule(\Closure $rule): void
+    {
+        static::$passwordResetRules[] = $rule;
+    }
+
+    /**
+     * Check whether the given user may complete the local password reset flow.
+     *
+     * @param  array<string, mixed>  $input
+     */
+    public static function canResetPassword(User $user, array $input = []): bool
+    {
+        foreach (static::$passwordResetRules as $rule) {
+            if (! $rule($user, $input)) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
     /**
      * Register any application services.
      */
@@ -92,7 +159,23 @@ class FortifyServiceProvider extends ServiceProvider
                 ->where('is_placeholder', '=', false)
                 ->first();
 
-            if ($user !== null && Hash::check($request->password, $user->password)) {
+            // Always run the hash check — against the real hash, or a dummy when
+            // there is no user — so login timing is identical either way (see
+            // ABSENT_USER_PASSWORD_HASH). Passwordless accounts (SSO-only users
+            // have password = null) fail here, so they cannot password-login.
+            $existingPasswordHash = $user->password ?? self::ABSENT_USER_PASSWORD_HASH;
+
+            $passwordIsValid = Hash::check((string) $request->password, $existingPasswordHash);
+
+            if ($user !== null && $passwordIsValid) {
+                // Credentials are valid; now apply any registered authorization
+                // rules (e.g. SSO enforcement may still block password login).
+                foreach (static::$loginRules as $rule) {
+                    if (! $rule($user, $request)) {
+                        return null;
+                    }
+                }
+
                 return $user;
             }