Implements password validation via the native Django framework.

evennia/settings_default.py

@@ -802,6 +802,29 @@ INSTALLED_APPS = (
 # This should usually not be changed.
 AUTH_USER_MODEL = "accounts.AccountDB"
 
+# Password validation
+# https://docs.djangoproject.com/en/1.11/ref/settings/#auth-password-validators
+AUTH_PASSWORD_VALIDATORS = [
+    {
+        'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
+    },
+    {
+        'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
+        'OPTIONS': {
+            'min_length': 8,
+        }
+    },
+    {
+        'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
+    },
+    {
+        'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
+    },
+    {
+        'NAME': 'evennia.contrib.security.validators.EvenniaPasswordValidator',
+    },
+]
+
 # Use a custom test runner that just tests Evennia-specific apps.
 TEST_RUNNER = 'evennia.server.tests.EvenniaTestSuiteRunner'