improve one time login security, remove utils

rc_hip/repapp/backends.py

@@ -1,11 +1,36 @@
 """
 Authentication backends for RepApp.
 """
+import unicodedata
 from django.contrib.auth import get_user_model
 from django.contrib.auth.backends import ModelBackend
 from mozilla_django_oidc.auth import OIDCAuthenticationBackend
-from .utils import generate_username, create_repapp_user
-from .models import OneTimeLogin
+from .models import OneTimeLogin, Organisator, Reparateur
+
+
+def generate_username(email):
+    # Using Python 3 and Django 1.11+, usernames can contain alphanumeric
+    # (ascii and unicode), _, @, +, . and - characters. So we normalize
+    # it and slice at 150 characters.
+    return unicodedata.normalize('NFKC', email)[:150]
+
+
+def create_repapp_user(user):
+    organisator = Organisator.objects.filter(mail=user.email).first()
+    if not organisator:
+        reparateur = Reparateur.objects.filter(mail=user.email).first()
+        if not reparateur:
+            reparateur = Reparateur(
+                name=user.username,
+                mail=user.email,
+            )
+            reparateur.save()
+        else:
+            reparateur.name = user.username
+            reparateur.save()
+    else:
+        organisator.name = user.username
+        organisator.save()
 
 
 class OneTimeLoginBackend(ModelBackend):

rc_hip/repapp/migrations/0004_alter_onetimelogin_secret.py

@@ -0,0 +1,18 @@
+# Generated by Django 4.2 on 2023-04-25 12:08
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('repapp', '0003_guest_user'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='onetimelogin',
+            name='secret',
+            field=models.CharField(max_length=200, unique=True, verbose_name='Geheimnis'),
+        ),
+    ]

rc_hip/repapp/models.py

@@ -5,7 +5,13 @@ import django.utils.timezone
 from django.db import models
 from django.utils.translation import gettext_lazy as _
 from django.contrib.auth.models import AbstractUser
-from .utils import device_directory_path
+
+
+def device_directory_path(instance, filename):
+    """
+    device_directory_path generates a device-specific storage path for file uploads.
+    """
+    return f'device_{instance.identifier}/{filename}'
 
 
 class CustomUser(AbstractUser):

rc_hip/repapp/utils.py

@@ -1,179 +0,0 @@
-import os
-import unicodedata
-import datetime
-import random
-from hashlib import sha256
-from django.template.loader import render_to_string
-from django.urls import reverse
-from django.core.mail import send_mail
-from django.contrib import messages
-from repapp.models import Organisator, Reparateur, OneTimeLogin
-
-
-def create_one_time_login(user, url) -> str:
-    """
-    create_one_time_login create a one time login object for user logins.
-    """
-    secret = sha256(
-        f'{user.email}{url}{datetime.datetime.now()}{random.randint(0,9999999)}'.encode(
-            'utf-8')
-    ).hexdigest()
-    hash = sha256(secret.encode('utf-8')).hexdigest()
-    otl = OneTimeLogin(
-        secret=hash,
-        user=user,
-        url=url,
-    )
-    otl.save()
-    return secret
-
-
-def send_one_time_login_mail(secret, mail, request):
-    url = request.build_absolute_uri(
-        f'/onetimelogin/{secret}/')
-    subject = render_to_string(
-        'repapp/mail/mail_one_time_login_subject.html').replace('\n', '')
-    text = render_to_string('repapp/mail/mail_one_time_login_text.html', {
-        'link': url,
-    })
-    html = render_to_string('repapp/mail/mail_one_time_login_html.html', {
-        'link': url,
-    })
-
-    ok = send_mail(
-        subject=subject,
-        message=text,
-        from_email=os.getenv("DJANGO_SENDER_ADDRESS", ""),
-        recipient_list=[mail],
-        fail_silently=True,
-        html_message=html
-    )
-
-    if ok > 0:
-        messages.add_message(request, messages.INFO,
-                             'Sie haben einen neuen Login per eMail erhalten.')
-
-
-def create_repapp_user(user):
-    organisator = Organisator.objects.filter(mail=user.email).first()
-    if not organisator:
-        reparateur = Reparateur.objects.filter(mail=user.email).first()
-        if not reparateur:
-            reparateur = Reparateur(
-                name=user.username,
-                mail=user.email,
-            )
-            reparateur.save()
-        else:
-            reparateur.name = user.username
-            reparateur.save()
-    else:
-        organisator.name = user.username
-        organisator.save()
-
-
-def generate_username(email):
-    # Using Python 3 and Django 1.11+, usernames can contain alphanumeric
-    # (ascii and unicode), _, @, +, . and - characters. So we normalize
-    # it and slice at 150 characters.
-    return unicodedata.normalize('NFKC', email)[:150]
-
-
-def send_confirmation_mails(device, guest, cafe, request):
-    organizers = []
-    for organizer in Organisator.objects.all():
-        organizers.append(organizer.mail)
-
-    text = render_to_string('repapp/mail/notice_new_device.html', {
-        'guest': device.guest,
-        'device': device,
-        'cafe': device.cafe,
-    })
-
-    send_mail(
-        subject=f"Neues Gerät { device.device }",
-        message=text,
-        from_email=os.getenv("DJANGO_SENDER_ADDRESS", ""),
-        recipient_list=organizers,
-        fail_silently=True
-    )
-
-    path = reverse('view_device', kwargs={
-                   'device_identifier': device.identifier})
-    url = request.build_absolute_uri(path)
-    secret = create_one_time_login(guest.user, url)
-    login_url = request.build_absolute_uri(f'/onetimelogin/{secret}/')
-
-    subject = render_to_string('repapp/mail/mail_register_device_subject.html', {
-        'cafe': cafe,
-    }).replace('\n', '')
-    text = render_to_string('repapp/mail/mail_register_device_text.html', {
-        'guest': guest,
-        'device': device,
-        'cafe': cafe,
-        'login_url': login_url,
-    })
-    html = render_to_string('repapp/mail/mail_register_device_html.html', {
-        'guest': guest,
-        'device': device,
-        'cafe': cafe,
-        'login_url': login_url,
-    })
-
-    mail_count = send_mail(
-        subject=subject,
-        message=text,
-        from_email=os.getenv("DJANGO_SENDER_ADDRESS", ""),
-        recipient_list=[f"{guest.mail}"],
-        fail_silently=True,
-        html_message=html
-    )
-
-    if mail_count > 0:
-        device.confirmed = True
-        device.save()
-    else:
-        messages.add_message(request, messages.ERROR,
-                             'Fehler beim senden der Bestätigungs-eMail!')
-
-
-def send_guest_account_mail(guest, password, request):
-    url = request.build_absolute_uri('/guest/profile/')
-    subject = render_to_string(
-        'repapp/mail/mail_new_guest_subject.html').replace('\n', '')
-    text = render_to_string('repapp/mail/mail_new_guest_text.html', {
-        'link': url,
-        'username': guest.user.email,
-        'password': password,
-    })
-    html = render_to_string('repapp/mail/mail_new_guest_html.html', {
-        'link': url,
-        'username': guest.user.email,
-        'password': password,
-    })
-
-    ok = send_mail(
-        subject=subject,
-        message=text,
-        from_email=os.getenv("DJANGO_SENDER_ADDRESS", ""),
-        recipient_list=[f"{guest.user.email}"],
-        fail_silently=True,
-        html_message=html
-    )
-
-    if ok > 0:
-        messages.add_message(request, messages.INFO,
-                             'Sie haben ihre Benutzerdaten per eMail erhalten.')
-
-
-def is_member(user):
-    organisator = Organisator.objects.filter(mail=user.email).first()
-    reparateur = Reparateur.objects.filter(mail=user.email).first()
-    return organisator or reparateur
-
-
-def device_directory_path(instance, filename):
-    """
-    device_directory_path generates a device-specific storage path for file uploads.
-    """
-    return f'device_{instance.identifier}/{filename}'

rc_hip/repapp/views.py

@@ -5,7 +5,12 @@ import datetime
 import random
 import string
 import time
+import os
 from hashlib import sha256
+from django.template.loader import render_to_string
+from django.urls import reverse
+from django.core.mail import send_mail
+from django.contrib import messages
 from django.views import generic
 from django.urls import reverse_lazy
 from django.shortcuts import get_object_or_404, render
@@ -15,11 +20,146 @@ from django.contrib import messages
 from django.contrib.auth.decorators import login_required
 from django.contrib.auth import authenticate, login
 from django.utils.timezone import now
-from repapp.models import CustomUser
+from repapp.models import CustomUser, Organisator, Reparateur
 from .models import Cafe, Device, Guest, OneTimeLogin
 from .forms import RegisterDevice, RegisterGuest
-from .utils import (send_confirmation_mails, create_one_time_login,
-                    send_one_time_login_mail, send_guest_account_mail, is_member)
+
+
+def send_one_time_login_mail(secret, mail, request):
+    url = request.build_absolute_uri(
+        f'/onetimelogin/{secret}/')
+    subject = render_to_string(
+        'repapp/mail/mail_one_time_login_subject.html').replace('\n', '')
+    text = render_to_string('repapp/mail/mail_one_time_login_text.html', {
+        'link': url,
+    })
+    html = render_to_string('repapp/mail/mail_one_time_login_html.html', {
+        'link': url,
+    })
+
+    ok = send_mail(
+        subject=subject,
+        message=text,
+        from_email=os.getenv("DJANGO_SENDER_ADDRESS", ""),
+        recipient_list=[mail],
+        fail_silently=True,
+        html_message=html
+    )
+
+    if ok > 0:
+        messages.add_message(request, messages.INFO,
+                             'Sie haben einen neuen Login per eMail erhalten.')
+
+
+def send_confirmation_mails(device, guest, cafe, request):
+    organizers = []
+    for organizer in Organisator.objects.all():
+        organizers.append(organizer.mail)
+
+    text = render_to_string('repapp/mail/notice_new_device.html', {
+        'guest': device.guest,
+        'device': device,
+        'cafe': device.cafe,
+    })
+
+    send_mail(
+        subject=f"Neues Gerät { device.device }",
+        message=text,
+        from_email=os.getenv("DJANGO_SENDER_ADDRESS", ""),
+        recipient_list=organizers,
+        fail_silently=True
+    )
+
+    path = reverse('view_device', kwargs={
+                   'device_identifier': device.identifier})
+    url = request.build_absolute_uri(path)
+    secret = create_one_time_login(guest.user, url)
+    login_url = request.build_absolute_uri(f'/onetimelogin/{secret}/')
+
+    subject = render_to_string('repapp/mail/mail_register_device_subject.html', {
+        'cafe': cafe,
+    }).replace('\n', '')
+    text = render_to_string('repapp/mail/mail_register_device_text.html', {
+        'guest': guest,
+        'device': device,
+        'cafe': cafe,
+        'login_url': login_url,
+    })
+    html = render_to_string('repapp/mail/mail_register_device_html.html', {
+        'guest': guest,
+        'device': device,
+        'cafe': cafe,
+        'login_url': login_url,
+    })
+
+    mail_count = send_mail(
+        subject=subject,
+        message=text,
+        from_email=os.getenv("DJANGO_SENDER_ADDRESS", ""),
+        recipient_list=[f"{guest.mail}"],
+        fail_silently=True,
+        html_message=html
+    )
+
+    if mail_count > 0:
+        device.confirmed = True
+        device.save()
+    else:
+        messages.add_message(request, messages.ERROR,
+                             'Fehler beim senden der Bestätigungs-eMail!')
+
+
+def send_guest_account_mail(guest, password, request):
+    url = request.build_absolute_uri('/guest/profile/')
+    subject = render_to_string(
+        'repapp/mail/mail_new_guest_subject.html').replace('\n', '')
+    text = render_to_string('repapp/mail/mail_new_guest_text.html', {
+        'link': url,
+        'username': guest.user.email,
+        'password': password,
+    })
+    html = render_to_string('repapp/mail/mail_new_guest_html.html', {
+        'link': url,
+        'username': guest.user.email,
+        'password': password,
+    })
+
+    ok = send_mail(
+        subject=subject,
+        message=text,
+        from_email=os.getenv("DJANGO_SENDER_ADDRESS", ""),
+        recipient_list=[f"{guest.user.email}"],
+        fail_silently=True,
+        html_message=html
+    )
+
+    if ok > 0:
+        messages.add_message(request, messages.INFO,
+                             'Sie haben ihre Benutzerdaten per eMail erhalten.')
+
+
+def is_member(user):
+    organisator = Organisator.objects.filter(mail=user.email).first()
+    reparateur = Reparateur.objects.filter(mail=user.email).first()
+    return organisator or reparateur
+
+
+def create_one_time_login(user, url) -> str:
+    """
+    create_one_time_login create a one time login object for user logins.
+    """
+    secret = sha256(
+        f'{user.email}{url}{datetime.datetime.now()}{random.randint(0,9999999)}'.encode(
+            'utf-8')
+    ).hexdigest()
+    hash = sha256(secret.encode('utf-8')).hexdigest()
+    otl = OneTimeLogin(
+        secret=hash,
+        user=user,
+        url=url,
+    )
+    otl.save()
+    return secret
 
 
 class IndexView(generic.ListView):