add change password

fet2020/authentications/authentications.py

@@ -1,9 +1,12 @@
 import logging
 
-from ldap3 import Server, Connection
+from ldap3 import Server, Connection, HASHED_SALTED_SHA, MODIFY_REPLACE
 from ldap3.core.exceptions import LDAPBindError
+from ldap3.utils.hashed import hashed
 
 logger = logging.getLogger(__name__)
+host = "ldap://juri.fet.htu.tuwien.ac.at"
+port = 389
 
 
 def authentication(username, password):
@@ -11,8 +14,7 @@ def authentication(username, password):
     if password is None or password.strip() == "":
         return None
 
-    server_uri = "ldap://juri.fet.htu.tuwien.ac.at"
-    server = Server(server_uri, port=389, use_ssl=True)
+    server = Server(host, port=port, use_ssl=True)
     userdn = f"uid={username},ou=user,dc=fet,dc=htu,dc=tuwien,dc=ac,dc=at"
 
     try:
@@ -21,9 +23,29 @@ def authentication(username, password):
             return username
 
     except LDAPBindError as e:
-        logger.info(f"LDAP Bind Error. Error: {e}")
+        logger.info(f"LDAP Bind error. Error: {e}")
     except Exception as e:
-        logger.info(f"Auth Exception. Error: {e}")
+        logger.info(f"Auth exception. Error: {e}")
 
     logger.info(f"This username has been typed: '{username}'")
     return None
+
+
+def change_password(username, old_password, new_password):
+    server = Server(host, port=port, use_ssl=True)
+    userdn = f"uid={username},ou=user,dc=fet,dc=htu,dc=tuwien,dc=ac,dc=at"
+
+    try:
+        c = Connection(server, user=userdn, password=old_password, auto_bind=True)
+
+        hashed_password = hashed(HASHED_SALTED_SHA, new_password)
+        c.modify(userdn, {"userPassword": [(MODIFY_REPLACE, [hashed_password])]})
+
+        return username
+
+    except LDAPBindError as e:
+        logger.info(f"LDAP Bind error. Error: {e}")
+    except Exception as e:
+        logger.info(f"Auth change-password exception. Error: {e}")
+
+    return None

fet2020/authentications/forms.py

@@ -1,7 +1,8 @@
-from django.contrib.auth.forms import AuthenticationForm
+from django.contrib.auth.forms import AuthenticationForm, PasswordChangeForm
 from django.contrib.auth.models import User
+from django.core.validators import ValidationError
 
-from .authentications import authentication
+from .authentications import authentication, change_password
 
 
 class LoginForm(AuthenticationForm):
@@ -26,3 +27,23 @@ class LoginForm(AuthenticationForm):
                 self.confirm_login_allowed(self.user_cache)
 
         return self.cleaned_data
+
+
+class LdapPasswordChangeForm(PasswordChangeForm):
+    def clean_old_password(self):
+        old_password = self.cleaned_data["old_password"]
+        if not authentication(self.user.username, old_password):
+            raise ValidationError(
+                self.error_messages["password_incorrect"],
+                code="password_incorrect",
+            )
+        return old_password
+
+    def clean(self):
+        old_password = self.cleaned_data["old_password"]
+        new_password = self.cleaned_data["new_password1"]
+        if not change_password(self.user, old_password, new_password):
+            raise ValidationError("Passwort im LDAP ändern funktioniert nicht.")
+
+    def save(self):
+        return self.user

fet2020/authentications/urls.py

@@ -8,4 +8,14 @@ app_name = apps.AuthenticationsConfig.name
 urlpatterns = [
     path("login/", views.AuthLoginView.as_view(), name="login"),
     path("logout/", views.logoutUser, name="logout"),
+    path(
+        "change-password/",
+        views.LdapPasswordChangeView.as_view(),
+        name="change-password",
+    ),
+    path(
+        "change-password/done/",
+        views.LdapPasswordChangeDoneView.as_view(),
+        name="password-change-done",
+    ),
 ]

fet2020/authentications/views.py

@@ -1,12 +1,13 @@
 from django.contrib.auth import logout
-from django.contrib.auth.views import LoginView
+from django.contrib.auth.views import LoginView, PasswordChangeDoneView, PasswordChangeView
 from django.shortcuts import redirect
 
 from documents.etherpadlib import del_ep_cookie
 
 from .decorators import authenticated_user
-from .forms import LoginForm
+from .forms import LdapPasswordChangeForm, LoginForm
 
+from django.urls import reverse_lazy, reverse
 
 class AuthLoginView(LoginView):
     authentication_form = LoginForm
@@ -26,3 +27,13 @@ def logoutUser(request):
     response = del_ep_cookie(request, response)
 
     return response
+
+
+class LdapPasswordChangeView(PasswordChangeView):
+    form_class = LdapPasswordChangeForm
+    success_url = reverse_lazy('authentications:password-change-done') 
+    template_name = "authentications/change_password.html"
+
+
+class LdapPasswordChangeDoneView(PasswordChangeDoneView):
+    template_name = "authentications/change_password_done.html"

fet2020/templates/authentications/change_password.html

@@ -0,0 +1,29 @@
+{% extends 'base.html' %}
+
+{% block title %}LDAP Passwort ändern{% endblock %}
+
+{% block content %}
+	<!-- Main Content -->
+	<main class="container mx-auto w-full px-4 my-8 flex-grow flex flex-col">
+		<h1 class="page-title">LDAP Passwort ändern</h1>
+
+        <div class="max-w-4xl mx-auto">
+            <span class="text-gray-700 dark:text-gray-200">Aus Sicherheitsgründen bitte zuerst das alte Passwort und darunter dann zweimal das neue Passwort eingeben, um sicherzustellen, dass es es korrekt eingegeben wurde.</span>
+        </div>
+
+        
+		<div class="w-full h-full flex-1 flex justify-center items-center">
+			<form action="{% url 'authentications:change-password' %}" method="POST" class="sm:p-4 sm:w-3/5 md:w-1/2 lg:w-2/5 xl:w-1/3 2xl:w-1/4 grid grid-cols-1 gap-3 sm:gap-6">
+                {% csrf_token %}
+
+                {% include "baseform/non_field_errors.html" %}
+
+                {% include "baseform/password.html" with field=form.old_password %}
+                {% include "baseform/password.html" with field=form.new_password1 %}
+                {% include "baseform/password.html" with field=form.new_password2 %}
+
+				<input type="submit" class="block btn btn-primary" value="Passwort ändern">
+			</form>
+		</div>
+	</main>
+{% endblock %}

fet2020/templates/authentications/change_password_done.html

@@ -0,0 +1,15 @@
+{% extends 'base.html' %}
+
+{% block title %}LDAP Passwort erfolgreich geändert{% endblock %}
+
+{% block content %}
+	<!-- Main Content -->
+	<main class="container mx-auto w-full px-4 my-8 flex-grow flex flex-col">
+		<h1 class="page-title">LDAP Passwort erfolgreich geändert</h1>
+
+        <div class="max-w-4xl mx-auto">
+            <span class="text-gray-700 dark:text-gray-200">Ihr Passwort wurde geändert.</span>
+        </div>
+
+	</main>
+{% endblock %}